Studies on drug resistance in mammalian cells. I. Amethopterin resistance in mouse fibroblasts.
D000818:Animals; D004351:Drug Resistance; D005347:Fibroblasts; D005493:Folic Acid Antagonists / Q000494:pharmacology*; D008727:Methotrexate; D046509:Tissue Culture Techniques / Q000494:pharmacology*
D005493:Folic Acid Antagonists; D008727:Methotrexate
FOLIC ACID ANTAGONISTS/pharmacology; TISSUE CULTURE/pharmacology