title: Clones of Chinese hamster cells cultivated in vitro not permanently resistant to azaguanine.
mesh_terms: D000630:Aminopterin / Q000494:pharmacology; D000818:Animals; D001375:Azaguanine / Q000494:pharmacology*; D002460:Cell Line; D002999:Clone Cells; D006224:Cricetinae; D003470:Culture Media; D004351:Drug Resistance; D005260:Female; D007042:Hypoxanthines / Q000494:pharmacology; D066298:In Vitro Techniques; D009154:Mutation; D010053:Ovary; D010430:Pentosyltransferases / Q000378:metabolism; D010641:Phenotype; D011336:Probability; D013936:Thymidine / Q000494:pharmacology
chemical_list: D003470:Culture Media; D007042:Hypoxanthines; D010430:Pentosyltransferases; D000630:Aminopterin; D001375:Azaguanine; D013936:Thymidine