Definition: Conferring on normal cells cultured in vitro the property of an infinite lifespan, as from spontaneous mutation, by exposure to chemical carcinogens, or by viral infection. Immortalization of primary cells in culture is the first of several steps in the expression of transforming genes of DNA tumor viruses, of retrovirus oncogenes, and cellular oncogenes derived from human cancer cells.
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Examples: glitazone, GI cocktail, etc.
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