US20040038204A1 - Targeted vectors - Google Patents

Targeted vectors Download PDF

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Publication number
US20040038204A1
US20040038204A1 US10/646,060 US64606003A US2004038204A1 US 20040038204 A1 US20040038204 A1 US 20040038204A1 US 64606003 A US64606003 A US 64606003A US 2004038204 A1 US2004038204 A1 US 2004038204A1
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Prior art keywords
clamping apparatus
rail
wear strip
spacer
flanges
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Abandoned
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US10/646,060
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Richard Murphy
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Canji Inc
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Canji Inc
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Publication date
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Priority to US10/646,060 priority Critical patent/US20040038204A1/en
Publication of US20040038204A1 publication Critical patent/US20040038204A1/en
Priority to US11/694,683 priority patent/US20070202524A1/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
    • C12N15/09—Recombinant DNA-technology
    • C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
    • C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
    • C12N15/85—Vectors or expression systems specially adapted for eukaryotic hosts for animal cells
    • C12N15/86—Viral vectors
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/70—Carbohydrates; Sugars; Derivatives thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
    • A61K47/69—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the conjugate being characterised by physical or galenical forms, e.g. emulsion, particle, inclusion complex, stent or kit
    • A61K47/6901—Conjugates being cells, cell fragments, viruses, ghosts, red blood cells or viral vectors
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P19/00—Preparation of compounds containing saccharide radicals
    • C12P19/26—Preparation of nitrogen-containing carbohydrates
    • C12P19/28—N-glycosides
    • C12P19/30—Nucleotides
    • C12P19/34—Polynucleotides, e.g. nucleic acids, oligoribonucleotides
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K48/00—Medicinal preparations containing genetic material which is inserted into cells of the living body to treat genetic diseases; Gene therapy
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N2710/00—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA dsDNA viruses
    • C12N2710/00011—Details
    • C12N2710/10011—Adenoviridae
    • C12N2710/10311—Mastadenovirus, e.g. human or simian adenoviruses
    • C12N2710/10341—Use of virus, viral particle or viral elements as a vector
    • C12N2710/10343—Use of virus, viral particle or viral elements as a vector viral genome or elements thereof as genetic vector
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N2710/00—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA dsDNA viruses
    • C12N2710/00011—Details
    • C12N2710/10011—Adenoviridae
    • C12N2710/10311—Mastadenovirus, e.g. human or simian adenoviruses
    • C12N2710/10341—Use of virus, viral particle or viral elements as a vector
    • C12N2710/10345—Special targeting system for viral vectors
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N2810/00—Vectors comprising a targeting moiety
    • C12N2810/50—Vectors comprising as targeting moiety peptide derived from defined protein
    • C12N2810/80—Vectors comprising as targeting moiety peptide derived from defined protein from vertebrates
    • C12N2810/85—Vectors comprising as targeting moiety peptide derived from defined protein from vertebrates mammalian
    • C12N2810/859—Vectors comprising as targeting moiety peptide derived from defined protein from vertebrates mammalian from immunoglobulins

Definitions

  • This invention pertains to the field of targeting of gene delivery systems (viral and non-viral) to particular cell and tissue types.
  • the invention provides a method of replacing a worn wear strip located between a rail and a retaining plate.
  • the method comprises positioning a new wear strip adjacent the worn wear strip. securing a clamping apparatus to the rail adjacent the new wear strip opposite the worn wear strip and moving the rail in a direction from the clamping apparatus towards the retaining plate until the clamping apparatus abuts the retaining plate.
  • the new wear strip pushes the worn wear strip from its position between the rail and the retaining plate.
  • the clamping apparatus may comprise a spacer between two flanges, with bolts inserted through the flanges and the spacer, and securing the clamping apparatus may comprise positioning the flanges on either side of the rail and tightening the bolts.
  • the spacer comprises a plurality of plates
  • securing the clamping apparatus may comprise selecting plates to make up the plurality of plates such that the spacer has a width slightly less than a width of the rail.
  • Moving the rail may be accomplished by hydraulic means.
  • the invention also provides a clamping apparatus configured to be secured to a rail.
  • the clamping apparatus comprises first and second flanges and a spacer.
  • the first and second flanges and spacer preferably all have at least one bolt hole therethrough, and at least one bolt inserted through the at least one bolt hole.
  • the at least one bolt hole through at least one of the first and second flanges may be threaded to secure the at least one bolt therein.
  • the clamping apparatus may comprise at least one nut, wherein the at least one bolt is threaded through the at least one nut.
  • the spacer may comprise a plurality of plates.
  • FIG. 1 illustrates one end of a grader blade held in place by retaining plates with a clamping apparatus and a new wear strip positioned on one of the moldboard rails, according to a preferred embodiment of the invention
  • FIG. 2 illustrates an enlarged view of the area indicated by numeral II in FIG. 1;
  • FIG. 3 illustrates a clamping apparatus according to another embodiment of the invention
  • FIG. 4 is an exploded view of the clamping apparatus of FIG. 3.
  • FIG. 1 shows one end 11 of a grader blade 10 held in place by upper and lower retaining plates 12 .
  • Retaining plates 12 are attached to arm 14 which is connected to the grader's frame (not shown).
  • Retaining plates 12 may be hingedly attached to arm 14 so that blade 10 may be removed or replaced.
  • a second arm may be located near the opposite end of blade 10 (not shown).
  • Hydraulic means (not shown) may be coupled to blade 10 to move blade 10 from side to side, as indicated by double arrow 15 .
  • one end of a hydraulic cylinder is attached to arm 14 and the other end is attached to blade 10 .
  • Blade 10 comprises upper and lower moldboard rails 16 which may be gripped by retaining plates 12 .
  • a wear strip 18 is located between each retaining plate 12 and its respective rail 16 .
  • New wear strip 18 A is held in place by gravity when positioned on the upper rail 16 .
  • To attach a new wear strip 18 A to the lower rail 16 one worker holds new wear stip 18 A in place as another worker moves blade 10 , as described below.
  • a worker operates the hydraulic means (not shown) to move blade 10 in the direction indicated by arrow 21 in FIG. 2 so that end 11 moves towards arm 14 .
  • clamping apparatus 20 urges new wear strip 18 A towards wear strip 18 .
  • a worker When replacing wear strip 18 on the lower rail 16 , a worker must hold new wear stip 18 A against rail 16 until clamping apparatus 20 abuts new wear strip 18 A and new wear strip 18 A abuts wear strip 18 .
  • New wear strip 18 A forces wear strip 18 out from under retaining plate 12 .
  • clamping apparatus 20 abuts retaining plate 12 , the user stops the movement of blade 10 .
  • New wear strip 18 A is now held in place between rail 16 and retaining plate 12 , in the same position previously occupied by wear strip 18 .
  • Clamping apparatus 20 preferably comprises flanges 22 , spacer 24 and bolts 26 .
  • Flanges 22 and spacer 24 define bolt holes 25 to accommodate bolts 26 .
  • Three bolts 26 are shown in the Figures, but it is to be understood that the invention will function so long as at least one bolt 26 (and corresponding bolt hole) is provided.
  • bolt holes 25 in flange 22 opposite the heads of bolts 26 are threaded to secure bolts 26 therein, but in the alternative, nuts (not shown) may be provided to secure bolts 26 .
  • Washers 27 may be positioned between the heads of bolts 26 and flange 22 .
  • Spacer 24 may comprise a plurality of plates 28 , as shown in FIGS. 3 and 4.
  • Plates 28 preferably have a variety of different widths. The user may vary the width of spacer 24 by selecting different plates 28 to comprise spacer 24 . Clamping apparatus 20 is secured to rail 16 by selecting plates 28 so that spacer 24 has a width slightly less than the width of rail 16 , placing flanges 22 over the edges of rail 16 and tightening bolts 26 .
  • spacer 24 may be a single unit with a width slightly less than the width of rails 16 of a specific grader.
  • spacer 24 may be permanently attached to one of the flanges 22 , or a portion of spacer 24 may be permanently attached to each of flanges 22 .

Abstract

This invention provides therapeutic and diagnostic agent delivery vehicles, including viral vectors, that are complexed to a targeting moiety by coordinate covalent linkages mediated by a transition metal ion. The complex is typically formed with a transition metal ion that is in a kinetically labile oxidation state; after the complex is formed, the oxidation state of the transition metal ion is changed to one that renders the complex kinetically stable. The use of a coordinate covalent linkage to attach the targeting moiety to the delivery vehicle provides advantages such as the ability to readily attach a different targeting moiety to a delivery vehicle without modifying the delivery vehicle itself. This flexibility is achieved without sacrificing stability of the complex.

Description

    CROSS-REFERENCE TO RELATED APPLICATION
  • This application claims benefit of U.S. Provisional Application No. 60/159,782, filed Oct. 15, 1999, which application is incorporated by reference for all purposes.[0001]
    • STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH
  • Not applicable. [0002]
    • BACKGROUND OF THE INVENTION
  • 1. Field of the Invention [0003]
  • This invention pertains to the field of targeting of gene delivery systems (viral and non-viral) to particular cell and tissue types. [0004]
  • 2. Background [0005]
  • The use of recombinant viral vectors for the delivery of exogenous genes to mammalian cells is well established. See e.g. Boulikas, T. in [0006] Gene Therapy and Molecular Biology Volume 1, pages 1-172 (Boulikas, Ed.) 1998, Gene Therapy Press, Palo Alto, Calif. However, certain viral vectors commonly used in such instances, such as adenoviruses, exhibit a broad tropism which permits infection and expression of the exogenous gene in a variety of cell types. While this can be useful in some instances, the treatment of certain diseases is enhanced if the virus is able to be modified so as “target” (i.e., to preferentially infect) only a limited type of cell or tissue.
  • A variety of approaches to create targeted viruses have been described in the literature. For example, cell targeting has been achieved with adenovirus vectors by selective modification of the viral genome knob and fiber coding sequences to achieve expression of modified knob and fiber domains having specific interaction with unique cell surface receptors. Examples of such modifications are described in Wickham et al. (1997) [0007] J. Virol. 71(11):8221-8229 (incorporation of RGD peptides into adenoviral fiber proteins); Arnberg et al. (1997) Virology 227:239-244 (modification of adenoviral fiber genes to achieve tropism to the eye and genital tract); Harris and Lemoine (1996) TIG 12(10):400-405; Stevenson et al. (1997) J. Virol. 71(6):4782-4790; acing wear strips is time consuming and leaves room for operator error. There exists a need for a more efficient and reliable way to replace wear strips.
    • SUMMARY OF THE INVENTION
  • The invention provides a method of replacing a worn wear strip located between a rail and a retaining plate. The method comprises positioning a new wear strip adjacent the worn wear strip. securing a clamping apparatus to the rail adjacent the new wear strip opposite the worn wear strip and moving the rail in a direction from the clamping apparatus towards the retaining plate until the clamping apparatus abuts the retaining plate. The new wear strip pushes the worn wear strip from its position between the rail and the retaining plate. [0008]
  • The clamping apparatus may comprise a spacer between two flanges, with bolts inserted through the flanges and the spacer, and securing the clamping apparatus may comprise positioning the flanges on either side of the rail and tightening the bolts. [0009]
  • The spacer comprises a plurality of plates, and securing the clamping apparatus may comprise selecting plates to make up the plurality of plates such that the spacer has a width slightly less than a width of the rail. [0010]
  • Moving the rail may be accomplished by hydraulic means. [0011]
  • The invention also provides a clamping apparatus configured to be secured to a rail. The clamping apparatus comprises first and second flanges and a spacer. The first and second flanges and spacer preferably all have at least one bolt hole therethrough, and at least one bolt inserted through the at least one bolt hole. [0012]
  • The at least one bolt hole through at least one of the first and second flanges may be threaded to secure the at least one bolt therein. Alternatively, the clamping apparatus may comprise at least one nut, wherein the at least one bolt is threaded through the at least one nut. [0013]
  • The spacer may comprise a plurality of plates.[0014]
    • BRIEF DESCRIPTION OF DRAWINGS
  • In drawings which illustrate non-limiting embodiments of the invention: [0015]
  • FIG. 1 illustrates one end of a grader blade held in place by retaining plates with a clamping apparatus and a new wear strip positioned on one of the moldboard rails, according to a preferred embodiment of the invention; [0016]
  • FIG. 2 illustrates an enlarged view of the area indicated by numeral II in FIG. 1; [0017]
  • FIG. 3 illustrates a clamping apparatus according to another embodiment of the invention; [0018]
  • FIG. 4 is an exploded view of the clamping apparatus of FIG. 3.[0019]
    • DESCRIPTION
  • Throughout the following description, specific details are set forth in order to provide a more thorough understanding of the invention. However, the invention may be practiced without these particulars. In other instances, well known elements have not been shown or described in detail to avoid unnecessarily obscuring the invention. Accordingly, the specification and drawings are to be regarded in an illustrative, rather than a restrictive, sense. [0020]
  • FIG. 1 shows one end [0021] 11 of a grader blade 10 held in place by upper and lower retaining plates 12. Retaining plates 12 are attached to arm 14 which is connected to the grader's frame (not shown). Retaining plates 12 may be hingedly attached to arm 14 so that blade 10 may be removed or replaced. A second arm may be located near the opposite end of blade 10 (not shown). Hydraulic means (not shown) may be coupled to blade 10 to move blade 10 from side to side, as indicated by double arrow 15. Generally, one end of a hydraulic cylinder is attached to arm 14 and the other end is attached to blade 10.
  • Blade [0022] 10 comprises upper and lower moldboard rails 16 which may be gripped by retaining plates 12. A wear strip 18 is located between each retaining plate 12 and its respective rail 16.
  • As best seen in FIG. 2, to replace wear strip [0023] 18, the user positions a new wear strip 18A adjacent wear strip 18 on rail 16. Throughout the description and claims, the term “adjacent”, as applied to two objects, shall be understood to mean that the two objects are near another, without another object between them, but shall not imply that the two objects are necessarily in contact. Clamping apparatus 20 is secured to rail 16 adjacent new wear strip 18A.
  • New wear strip [0024] 18A is held in place by gravity when positioned on the upper rail 16. To attach a new wear strip 18A to the lower rail 16, one worker holds new wear stip 18A in place as another worker moves blade 10, as described below.
  • A worker operates the hydraulic means (not shown) to move blade [0025] 10 in the direction indicated by arrow 21 in FIG. 2 so that end 11 moves towards arm 14. As blade 10 moves in the direction indicated by arrow 21, clamping apparatus 20 urges new wear strip 18A towards wear strip 18. When replacing wear strip 18 on the lower rail 16, a worker must hold new wear stip 18A against rail 16 until clamping apparatus 20 abuts new wear strip 18A and new wear strip 18A abuts wear strip 18. New wear strip 18A forces wear strip 18 out from under retaining plate 12. When clamping apparatus 20 abuts retaining plate 12, the user stops the movement of blade 10. New wear strip 18A is now held in place between rail 16 and retaining plate 12, in the same position previously occupied by wear strip 18.
  • Clamping apparatus [0026] 20 preferably comprises flanges 22, spacer 24 and bolts 26. Flanges 22 and spacer 24 define bolt holes 25 to accommodate bolts 26. Three bolts 26 are shown in the Figures, but it is to be understood that the invention will function so long as at least one bolt 26 (and corresponding bolt hole) is provided. Preferably, bolt holes 25 in flange 22 opposite the heads of bolts 26 are threaded to secure bolts 26 therein, but in the alternative, nuts (not shown) may be provided to secure bolts 26. Washers 27 may be positioned between the heads of bolts 26 and flange 22. Spacer 24 may comprise a plurality of plates 28, as shown in FIGS. 3 and 4. Plates 28 preferably have a variety of different widths. The user may vary the width of spacer 24 by selecting different plates 28 to comprise spacer 24. Clamping apparatus 20 is secured to rail 16 by selecting plates 28 so that spacer 24 has a width slightly less than the width of rail 16, placing flanges 22 over the edges of rail 16 and tightening bolts 26.
  • Alternatively, spacer [0027] 24 may be a single unit with a width slightly less than the width of rails 16 of a specific grader. As a further alternative, spacer 24 may be permanently attached to one of the flanges 22, or a portion of spacer 24 may be permanently attached to each of flanges 22.
  • As will be apparent to those skilled in the art in the light of the foregoing disclosure, many alterations and modifications are possible in the practice of this invention without departing from the spirit or scope thereof. Accordingly, the scope of the invention is to be construed in accordance with the substance defined by the following claims. [0028]

Claims (7)

What is claimed is:
1. A method of replacing a worn wear strip located between a rail and a retaining plate, the method comprising
(a) positioning a new wear strip adjacent the worn wear strip;
(b) securing a clamping apparatus to the rail adjacent the new wear strip opposite the worn wear strip; and,
(c) moving the rail in a direction from the clamping apparatus towards the retaining plate until the clamping apparatus abuts the retaining plate, the new wear strip pushing the worn wear strip from its position between the rail and the retaining plate.
2. The method of claim 1 wherein the clamping apparatus comprises a spacer between two flanges, with bolts inserted through the flanges and the spacer, and wherein securing the clamping apparatus comprises positioning the flanges on either side of the rail and tightening the bolts.
3. The method of claim 2 wherein the spacer comprises a plurality of plates, and wherein securing the clamping apparatus comprises selecting plates to make up the plurality of plates such that the spacer has a width slightly less than a width of the rail.
4. The method of claim 1 wherein moving the rail is accomplished by hydraulic means.
5. A clamping apparatus configured to be secured to a rail, the clamping apparatus comprising first and second flanges and a spacer, the first and second flanges and spacer all having at least one bolt hole therethrough, and at least one bolt inserted through the at least one bolt hole.
6. The clamping apparatus of claim 5 wherein the at least one bolt hole through at least one of the first and second flanges is threaded to secure the at least one bolt therein.
7. The clamping apparatus of claim 5 further comprising at least one nut, wherein the at leasmethods for targeting vectors, which have significant limitations as previously discussed. First, one need not reengineer a viral genome, for example, to modify the gene that encodes the surface protein each time one wishes to use a different targeting ligand. One simply employs a different CM-targeting ligand to retarget the vector and modify its tropism. Second, coordinate covalent complexes are kinetically inert, resulting in a long-lasting targeted vector. In contrast, attachment of targeting ligands by means of non-covalent linkage, for example, antibodies that bind to viral coat proteins is not kinetically inert.
It is essential that one appreciate the distinction between a kinetically inert and a thermodynamically stable complex. This distinction is discussed in detail in Anderson et al. (U.S. Pat. No. 5,439,829 issued Aug. 8, 1995). Thermodynamic stability refers to the thermodynamic tendency of a species to exist under equilibrium conditions. A kinetically inert complex, on the other hand, is one that is not labile, i.e., a particular complexed ion is not able to readily engage in reactions that result in replacement of one or more ligands in its coordination sphere by others. For example, in an aqueous environment, unoccupied coordination positions on a transition metal ion are occupied by water. A chelating peptide or other chelating agent must displace the water molecules to form a complex. When such reactions occur rapidly, the reaction is termed “labile.” However, where such reactions occur very slowly or not at all, the complex is said to be kinetically “inert.” Kinetic lability or inertness, unlike thermodynamic stability or instability, is thus related to the reaction rate. A
US10/646,060 1999-10-15 2003-08-22 Targeted vectors Abandoned US20040038204A1 (en)

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US10/646,060 US20040038204A1 (en) 1999-10-15 2003-08-22 Targeted vectors
US11/694,683 US20070202524A1 (en) 1999-10-15 2007-03-30 Targeted Vectors

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US15978299P 1999-10-15 1999-10-15
US09/687,930 US6635476B1 (en) 1999-10-15 2000-10-13 Targeted vectors
US10/646,060 US20040038204A1 (en) 1999-10-15 2003-08-22 Targeted vectors

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US09/687,930 Continuation US6635476B1 (en) 1999-10-15 2000-10-13 Targeted vectors

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US11/694,683 Continuation US20070202524A1 (en) 1999-10-15 2007-03-30 Targeted Vectors

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US10/646,060 Abandoned US20040038204A1 (en) 1999-10-15 2003-08-22 Targeted vectors
US11/694,683 Abandoned US20070202524A1 (en) 1999-10-15 2007-03-30 Targeted Vectors

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