WO1989004488A1 - Enzyme immunoassay for detecting hiv antigens in human sera - Google Patents
Enzyme immunoassay for detecting hiv antigens in human sera Download PDFInfo
- Publication number
- WO1989004488A1 WO1989004488A1 PCT/US1988/003698 US8803698W WO8904488A1 WO 1989004488 A1 WO1989004488 A1 WO 1989004488A1 US 8803698 W US8803698 W US 8803698W WO 8904488 A1 WO8904488 A1 WO 8904488A1
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- WIPO (PCT)
- Prior art keywords
- hiv
- immunoassay
- test sample
- antibody
- antigen
- Prior art date
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Classifications
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- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
- G01N33/54306—Solid-phase reaction mechanisms
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- C—CHEMISTRY; METALLURGY
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- C07K—PEPTIDES
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- C07K16/08—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from viruses
- C07K16/10—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from viruses from RNA viruses
- C07K16/1036—Retroviridae, e.g. leukemia viruses
- C07K16/1045—Lentiviridae, e.g. HIV, FIV, SIV
- C07K16/1054—Lentiviridae, e.g. HIV, FIV, SIV gag-pol, e.g. p17, p24
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- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/569—Immunoassay; Biospecific binding assay; Materials therefor for microorganisms, e.g. protozoa, bacteria, viruses
- G01N33/56983—Viruses
- G01N33/56988—HIV or HTLV
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Definitions
- This invention provides an improved immunoassay for detecting HIV antigens in a human physiological fluid test sample which may have circulating antigens.
- This invention in a preferred embodiment provides a unique enzyme immunoassay which can be performed for detecting HIV virus, HIV virus fragments or HIV in ⁇ fected cells.
- This immunoassay provides a test result of positive or negative HIV antigen, as the case may be, with a greater degree of accuracy or sensitivity, consistency and in a shorter period of time than has been realized heretofore in an HIV antigen assay.
- the assay embodying the invention uses solid-phase assay methodology in which a monoclonal antibody specific to certain HIV core antigens is coated on the solid surface.
- HIV infec ⁇ tion commonly results in AIDS (Acquired Immune Deficiency Syndrome).
- Reported increasing numbers of AIDS patients in the United States has caused the dis ⁇ ease to be recognized as approaching epidemic propor ⁇ tions with no known cure or vaccine.
- the occurrence of AIDS has been increasing primarily in Europe and Afri ⁇ can countries of the world as the disease is trans- mitted through sexual activity, drug abuse, con ⁇ taminated organs in transplantation procedures and by blood transfusions.
- Other strains of the HIV such as HTLV IV are developing through mutation of this virus.
- Human antibody develops in 70-80% of the people exposed to HIV through sexual intercourse, blood trans ⁇ fusions, contaminated organs through transplantation or contaminated needles by drug abusers. The remaining 20-30% of exposed individuals who do not develop antibodies against the invading virus for a period of up to six months can remain undetected carriers in society. Therefore, if one is to effectively screen blood and organ donors, individuals, or blood products for containing the spread of AIDS, it is essential that the screening immunoassay be able to detect not only HIV antibody but also HIV virus itself and/or infected cells carrying the virus.
- the assay embodying the invention successfully tests for the virus and virus infected cells.
- the as ⁇ say can be performed in a single vessel such as a mi- crotiter plate well.
- the patient's test sample comprises human plasma, i.e., whole blood from which all cells have been removed initially, or serum, i.e., plasma from which all clotting factors have been removed.
- the assay provides a result of "positive” or "negative” as the case may be, by enzyme immunoassay (EIA).
- EIA enzyme immunoassay
- the suitability of the use of the assay of this invention to identify AIDS infected patients is sig ⁇ nificantly greater than has been realized heretofore where an immunoassay tracks only antibodies to HIV in a physiological sample such as peripheral blood.
- the test result is achieved in approximately four hours.
- Lysing of viral concentrates to release viral proteins prior to using electrophoresis to spread viral proteins, i.e., antigens, on polyacrylamide gel is known with respect to a Western blot technique for con ⁇ firming the presence of only anti-HIV antibodies, not antigens, and is thus of no practical utility during that period of time prior to when no antibodies are present even though the patient has been infected with HIV.
- an HIV viral lysate as a solid phase protein adhered " to a solid phase support, such as a microtiter plate formed of polystyrene is known with respect to an ELISA technique for screening for anti-HIV antibodies, not antigens, during the peri ⁇ od after HIV infection when no antibodies are present.
- an enzyme immunoassay for testing HIV antigen in a human physiological fluid test sample such as plasma or serum or cell culture supernatant.
- the immunoassay is used to test a single sample for HIV antigens wherein the methodology used is that of solid-phase as ⁇ say, e.g., enzyme-linked immunosorbent assay (ELISA) that uses microtiter strips, polystyrene beads, or fer- rous beads, for example, as support media.
- ELISA enzyme-linked immunosorbent assay
- the test sample or specimen of predetermined volume such as 200 micro- liters (--/L)
- a cell lysing reagent is introduced and the mixture incubated for a suitable period of time at 37°C.
- a quantity of preferably human anti-HIV antibody biotin complex reagent is added and incubated for a suitable period of time.
- the sample is then sub ⁇ jected to incubation procedures which utilize selected developing reagents. The entire assay is completed in approximately four hours.
- the immunoassay of this invention differs from that described in the related application in three major respects.
- the use of the so-called "Spike” is eliminated.
- the preferably human anti-HIV antibody biotin complex has a particular formulation.
- the solid phase is coated with a unique monoclonal antibody iden- tified as the KC-57 monoclonal antibody.
- an assay of a single sample for simultaneous detection of HIV antigen and/or HIV antibody in a human physiological test sample such as plasma or serum.
- Microwells such as of a microtiter plate having microwell strips, are coated with HIV antibody obtained from sera which exhibit high titers of anti-HIV antibody.
- the solid-phase support media i.e., the microtiter plate is prepared for the assay by coating the wells with purified anti-HIV antibody derived from a high titer mammalian serum or plasma source such as from a human, goat or other species.
- Test sample is added to one coated microwell, or preferably several coated microwells, since duplicate tests are preferred.
- Control wells are provided for normal, i.e., antigen and antibody negative, physiological fluid, e.g., normal human plasma or serum.
- An antigen positive control well preferably is also used.
- a known amount of HIV antigen, i.e. the "Spike" is added to each sample microwell and each con ⁇ trol well or wells and the so-combined sample and added antigen subjected to a lyse buffer to assure disruption of virus present in the test sample into its component parts. After a simple incubation at body temperature the microtiter plate is washed to remove material which might interfere with the signal producing system and the captured antigen is next allowed to react with anti-HIV antibody which has been conjugated with biotin.
- kits In the practice of the preferred embodiment of this invention such a kit comprises: A 96 well polystyrene microtiter plate with the wells coated with anti-HIV antibody; A supply of plate covers; Lyse Buffer;
- TMB Tetramethylbenzidien
- TMB Substrate Buffer Normal Human Plasma Control
- Normal Human Serum Control Normal Human Serum Control
- the reagents are generally required to be prepared in advance so that they will be available at the ap ⁇ basementte steps in carrying out the exemplary preferred immunoassay procedure. These steps are as follows:
- Peroxide-free octylphenopoly (ethyleneglycolether) e.g. Triton X-100, Boehringer Mannheim Biochemicals 5% Polyoxy thylenesorbiton monolaurate e.g. Tween 20, Sigma Chemical Co. 2%
- HIV antigen content sufficient when diluted with antigen diluent to provide Spike of 50 picograms of HIV antigen per 20 //L of diluted reagent.
- concentration of antigen in the Spike may be determined on the basis of P24 equivalent by use of a DuPont P24 Radioimmunoassay (RIA).
- Antigen Diluent :
- BSA Protease-Free Bovine Serum Albumin
- Citric acid monohydrate 11.38g
- IPX Wash Buffer (Diulte 1 to 10):
- the immunoassay embodying the invention of the re- latedr-application preferably is performed in a familiar microtiter plate well.
- a 200 microliter ( L) patient sample is tested.
- the patient sample may comprise human plasma derived from whole blood from which the cells have been removed by centrifugat on, for instance, serum, or cultured cells.
- the test sample of 200 tL is introduced into the well of a microtiter plate which has been coated with a heat inactivated purified anti-HIV antibody.
- the purified anti-HIV antibody is derived from a high titer serum or plasma source. Such a source can be a human one.
- a source can be a human one.
- the mammalian antibody e.g., human anti-HIV antibody is diluted to 2.5 micrograms per mililiter in so-called "plating buffer".
- the plating buffer is comprised of 250 mM of potassium phosphate at pH 6.0. 250 M I> of diluted antibody is pipetted into the well and stored at 4°C for approximately sixteen hours.
- the well is then drained and washed three times in a phosphate buffered saline (PBS) wash solution.
- PBS phosphate buffered saline
- the well is then blocked for one hour at room temperature with 330 /L of a blocking reagent comprising 1% bovine serum albumin
- BSA Bactease free
- Sucrose 5% Sucrose plus 1% sodium ethyl- mercurithiosalicylate in 1 times PBS filtered through a 0.2.um filter.
- the well is stored for up to six hours with the blocking solution at 4°C until dried.
- the well is then drained, speed vacuum dried and stored at 4°C in a bag with dryite desiccant bag.
- the well After incubation, the well is aspirated and washed three times in a conventional manner with wash buffer.
- the anti-HIV antibody-biotin which is preferably in a lyophilized state is reconstituted and diluted to a 5% solution with biotin reagent diluent and 200 L added to the well and the plate incubated at 37°C for one hour.
- the well After incubation, the well is aspirated and washed three times using the Wash Buffer reagent. Then 200 -uL of the streptavidin-peroxidase conjugate is added to the well, covered and incubated for thirty minutes at 37°C. After incubation, the well is aspirated and washed three times with the Wash Buffer. Then, 200 /L of TMB Substrate Solution is introduced to the well, covered and incubated for thirty minutes at room temperature.
- the immunoassay embodying the invention provides for a quantitated patient sample including a predetermined quantity of a Spike of inactivated HIV viral antigen, which is detectable at a designated picogram sensitivity, to be introduced into an antibody coated microtiter well.
- Various conventional incuba ⁇ tions follow, using prescribed human developing agents, such as, biotin covalently coupled to a mammalian specie derived anti-HIV antibody such as derived from a human.
- the coupling is followed by a step of forming a biotin-avidin conjugated peroxidase complex after which the TMB substrate is added to provide colormetric visualization of the reaction.
- HIV antibody biotin conjugate employed a long chain biotin.
- concentration of Spike antigen and the antigen in the patient sample placed in the well which binds to the capture antibody coated walls of the well is then recognized by the anti-HIV antibody which is biotinylated and the complex then reacted with the avidin peroxidase and TMB substrate for visualization of the reaction. After stopping the reaction, the EIA readings can be taken to compare against control directed readings.
- the reading obtained from the patient test sample is compared to the control readings such as those ob- tained from normal human plasma free of HIV antigen, anti-HIV antibody, or non-infectious virus subjected to the immunoassay procedure.
- control readings such as those ob- tained from normal human plasma free of HIV antigen, anti-HIV antibody, or non-infectious virus subjected to the immunoassay procedure.
- a series of tests were conducted in accordance with the above described improved ELISA protocol for simultaneous determination in a single test well of both HIV antigen and/or anti-HIV antibody.
- the tests were conducted on plasma and serum derived from blood samples obtained at five medical institutes from patients suspected of being exposed to HIV, diagnosed as having an ARC or suspected of having, or diagnosed as having AIDS.
- three 96 well mi- crotiter plates were used to perform 99 assays.
- the samples were all subjected to a screening test by an ELISA technique other than that of the present invention and were also subjected to a confirmation test using a Western blot technique for analysis and identification of HIV proteins P24 and P120 before as ⁇ signing a "score" of positive or negative to the sample.
- 70 or 70.7% were determined to be positive to either HIV antigen or anti-HIV antibody and 29 or 29.3% determined to be negative to either HIV antigen or anti-HIV antibody.
- 6 samples or about 6.1% were found to be both HIV antigen and anti-HIV antibody positive.
- the particular significance of the immunoassay comprising the present invention will be appreciated from the fact that 17 of the samples determined to be "positive" were found to only be posi ⁇ tive with respect to HIV antigen.
- test data compiled as a result of the Western blot confirmation tests performed appears to indicate that about 10% of the tests performed by the method of the present invention are subject to a false positive result and about 15% are subject to a false negative determination. It will be appreciated that the per- centage of false results may be attributable to factors which were not determined, such as human error in con ⁇ ducting the test or reading the result. Thus, the per ⁇ centage of apparent false results is not a true reflec ⁇ tion of the efficacy of the exemplary test run de- scribed herein.
- the solid-phase support media is a microtiter plate prepared for the assay by coating the wells.with a novel monoclonal antibody which recognizes a common epitope of certain core antigens and no envelope HIV antigens in a human physiological test sample.
- This monoclonal antibody was produced from a hybridoma or cell line developed at the laboratories of the common assignee by co-inventors common with those of this as ⁇ say invention.
- the monoclonal antibody is identified as the KC-57 monoclonal antibody which recognizes an epitope common to the HIV antigens P55, P24 and partial breakdown products P39 and P33.
- the KC-57 antibody does not bind the P18 core antigen or any other HIV as- sociated antigens.
- a cell line which produces the KC-57 monoclonal antibody corresponding to that used in this invention has been deposited in the American Type Culture Collec- tion, Rockville, Maryland 20852 on November 6, 1987, concurrently with the filing of this application.
- the cell line was assigned A.T.C.C. No. HB 9585.
- Coating of one or more microtiter wells with the KC-57 monoclonal antibody is performed in substantially the same manner as described in the related applica ⁇ tion.
- the KC-57 antibody is diluted to 2.5 micrograms per milliliter in the so-called "plating buffer”. 250 microliters of diluted monoclonal antibody is pipetted into the well, stored, washed, blocked, dried, speed drained and stored again as herein described.
- a plurality of wells can be coated using commercially available automated pipetting apparatus.
- a 200 microliter patient sample is tested, the sample being human serum or plasma derived from whole blood serum or culture cells.
- the 200 microliter sample is pipetted into a well and 20zL of Lyse Buffer for lysing infected cells is added.
- the well is cov ⁇ ered and then incubated for one hour at 37°C.
- the well is aspirated and washed three times in a conventional manner with wash buffer.
- 200 - ⁇ L of Anti-HIV Antibody-Biotin Complex reagent preferably lyophilized, is added in a reconstituted state.
- the Anti-HIV antibody preferably is derived from a human source, i.e., a high titer serum or plasma source.
- This reagent is reconstituted to a predeter ⁇ mined volume so that 200 /il * of the reconstituted reagent can be introduced to a well.
- the plate is in ⁇ cubated for one hour at 37°C. Thereafter, the well is aspirated and washed three times using a Wash Buffer reagent.
- the EIA readings taken can be compared against control directed readings, such as those obtained from normal human plasma or serum free of HIV antigen in a KC-57 monoclonal antibody coated well acting as a nega ⁇ tive control or those obtained from such a coated well into which 50 /L of a virus antigen reagent was intro- prised.
- the latter procedure would provide a positive control.
- the assay embodying the invention would employ a pair of positive control wells. 200 L of patient sample would be used in each of the above control well procedures.
- an ELISA immunoassay is not the only one applicable to this invention. Thus, other methodologies as enumerated herein are considered to be applicable.
- Table 2 reflects data developed to show the ac- curacy of the assay embodying the invention.
- Normal human serum and normal human serum to which the p24 core antigen was added were assayed.
- the levels of p24 spiked are itemized for each category of test conducted. At the 25 picogram (pg) and 6.25 pg per 200 microliters spiked level, 100% tested positive. At the 1.56 pg level, 87% tested positive. Normal hu ⁇ man serum did not test positive in 156 assays per ⁇ formed.
- Table 3 demonstrates that the HIV antigen assay utilizing the KC-57 monoclonal antibody as a capture phase and human anti-HIV antibody as the detector phase identified all strains listed as being positive for HIV antigen content.
- the above graph demonstrates the sensitivity achieved with t assay analysing p24 antigen into normal human plasma. This data was collected by six individual assays run on separate days. A positive value, twice the background absorbance was obtained at 1.2 pg/well or 6 pg/ml. Interassay variation ranged from 11-26 percent.
- HIV antigen content sufficient when diluted with an appropriate diluent which will provide an Antigen Reagent concentration of 25 pg p24 per
- BIOTIN REAGENT (4 X CONCENTRATE) 125 ML
- Citric Acid Monohydrate 11.38 g
- the immunoassay embodying the invention achieves important advantages.
- the stability of the enzyme color reaction for a test is up to four (4) hours. This means that there will be no concern about checking a color determination after a test is completed since replication is possible for up to four hours there- after.
- 90-91 tests can be conducted within an approximate four hour period since the wells will already be coated with KC- 57 monoclonal antibody.
- Applicants are not aware of any HIV antigen assay capable of this productivity in so short a period of time.
- the sensitivity and replication of results achieved with this assay is entirely without precedent in the art as known to ap- plicants.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3853430T DE3853430T2 (en) | 1987-11-06 | 1988-10-24 | ENZYME IMMUNOTEST METHOD FOR DETECTING HIV ANTIGENS IN HUMAN SERES. |
AU28148/89A AU612760B2 (en) | 1987-11-06 | 1988-10-24 | Enzyme immunoassay for detecting hiv antigens in human sera |
EP89900430A EP0386136B1 (en) | 1987-11-06 | 1988-10-24 | Enzyme immunoassay for detecting hiv antigens in human sera |
KR1019890701260A KR890702038A (en) | 1987-11-06 | 1988-10-24 | Enzyme Immunoassay for Detection of HIV Antigen in Human Serum |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/118,149 US4886742A (en) | 1987-06-15 | 1987-11-06 | Enzyme immunoassay for detecting HIV antigens in human sera |
US118,149 | 1987-11-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1989004488A1 true WO1989004488A1 (en) | 1989-05-18 |
Family
ID=22376766
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1988/003698 WO1989004488A1 (en) | 1987-11-06 | 1988-10-24 | Enzyme immunoassay for detecting hiv antigens in human sera |
Country Status (13)
Country | Link |
---|---|
US (1) | US4886742A (en) |
EP (1) | EP0386136B1 (en) |
JP (1) | JPH03502241A (en) |
KR (1) | KR890702038A (en) |
CN (1) | CN1021375C (en) |
CA (1) | CA1337264C (en) |
DE (1) | DE3853430T2 (en) |
ES (1) | ES2009368A6 (en) |
IE (1) | IE61407B1 (en) |
IL (1) | IL88248A (en) |
MX (1) | MX168290B (en) |
WO (1) | WO1989004488A1 (en) |
ZA (1) | ZA888170B (en) |
Cited By (1)
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WO1991019000A1 (en) * | 1990-06-01 | 1991-12-12 | Gruppo Lepetit S.P.A. | A MONOCLONAL ANTIBODY AGAINST THE GAG PROTEIN PRECURSOR p55 OF HUMAN IMMUNODEFICIENCY VIRUS |
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US5756352A (en) * | 1995-06-07 | 1998-05-26 | Gen-Probe Incorporated | Thiocationic lipid-nucleic acid conjugates |
US5711964A (en) * | 1995-06-07 | 1998-01-27 | United States Of America | Method for the intracellular delivery of biomolecules using liposomes containing cationic lipids and vitamin D |
US5851548A (en) * | 1995-06-07 | 1998-12-22 | Gen-Probe Incorporated | Liposomes containing cationic lipids and vitamin D |
DE19539574A1 (en) * | 1995-10-25 | 1997-04-30 | Boehringer Mannheim Gmbh | Preparations and processes for stabilizing biological materials by means of drying processes without freezing |
US6265184B1 (en) * | 1995-12-20 | 2001-07-24 | Icos Corporation | Polynucleotides encoding chemokine receptor 88C |
US5968731A (en) * | 1996-12-10 | 1999-10-19 | The Regents Of The University Of California | Apparatus for automated testing of biological specimens |
US5841975A (en) * | 1996-12-10 | 1998-11-24 | The Regents Of The University Of California | Method and apparatus for globally-accessible automated testing |
US5925514A (en) * | 1996-12-10 | 1999-07-20 | The Regents Of The University Of California | Apparatus for testing for infection by a retrovirus |
US6818392B2 (en) | 2000-12-06 | 2004-11-16 | Abbott Laboratories | Monoclonal antibodies to human immunodeficiency virus and uses thereof |
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CA2832109C (en) | 2011-06-10 | 2021-07-06 | Oregon Health & Science University | Cmv glycoproteins and recombinant vectors |
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ES2631608T3 (en) | 2012-06-27 | 2017-09-01 | International Aids Vaccine Initiative | Env-glycoprotein variant of HIV-1 |
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- 1987-11-06 US US07/118,149 patent/US4886742A/en not_active Expired - Lifetime
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1988
- 1988-10-24 KR KR1019890701260A patent/KR890702038A/en not_active Application Discontinuation
- 1988-10-24 WO PCT/US1988/003698 patent/WO1989004488A1/en not_active Application Discontinuation
- 1988-10-24 JP JP1500960A patent/JPH03502241A/en active Pending
- 1988-10-24 EP EP89900430A patent/EP0386136B1/en not_active Revoked
- 1988-10-24 DE DE3853430T patent/DE3853430T2/en not_active Revoked
- 1988-10-25 IE IE322588A patent/IE61407B1/en not_active IP Right Cessation
- 1988-10-31 IL IL88248A patent/IL88248A/en not_active IP Right Cessation
- 1988-11-01 ZA ZA888170A patent/ZA888170B/en unknown
- 1988-11-01 CA CA000581855A patent/CA1337264C/en not_active Expired - Fee Related
- 1988-11-04 ES ES8803361A patent/ES2009368A6/en not_active Expired
- 1988-11-04 MX MX013672A patent/MX168290B/en unknown
- 1988-11-05 CN CN88107599A patent/CN1021375C/en not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
DE3853430T2 (en) | 1995-10-12 |
EP0386136A1 (en) | 1990-09-12 |
IL88248A (en) | 1993-03-15 |
CA1337264C (en) | 1995-10-10 |
IE61407B1 (en) | 1994-11-02 |
DE3853430D1 (en) | 1995-04-27 |
CN1021375C (en) | 1993-06-23 |
CN1036837A (en) | 1989-11-01 |
ZA888170B (en) | 1990-07-25 |
EP0386136B1 (en) | 1995-03-22 |
IE883225L (en) | 1988-05-06 |
EP0386136A4 (en) | 1991-06-12 |
KR890702038A (en) | 1989-12-22 |
MX168290B (en) | 1993-05-14 |
US4886742A (en) | 1989-12-12 |
IL88248A0 (en) | 1989-06-30 |
ES2009368A6 (en) | 1989-09-16 |
JPH03502241A (en) | 1991-05-23 |
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