BioTime, Inc. is a biotechnology company focused on the emerging field of regenerative medicine. Its commercial strategy is focused on its line of research products, such as ACTCellerate cell lines and associated ESpan culture media, HyStem hydrogels, human embryonic stem (hES) cell lines, and royalties from Hextend. Its focus is to provide regenerative therapies for age-related degenerative diseases. In January 2011, the Company acquired the assets of Cell Targeting, Inc. (CTI), a biotechnology company focused on methods of painting molecules on the surface of cells, which in turn causes the cells to adhere to particular tissues, such as those afflicted with disease. In October 2013, Geron Corporation announced the closing of the transaction to divest the Company's stem cell assets to Asterias Biotherapeutics, Inc., a subsidiary of BioTime, Inc.