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[22] DIDDENS H, 1983, CHEM BIOL PTERIDINES, P953

[23] CORRELATION OF DIHYDROFOLATE-REDUCTASE ELEVATION WITH GENE AMPLIFICATION IN A HOMOGENEOUSLY STAINING CHROMOSOMAL REGION IN L5178Y CELLS [J]. JOURNAL OF CELL BIOLOGY, 1979, 83 (02) : 394 - 402

[24] FISCHER GA, 1961, BIOCHEM PHARMACOL, V7, P75

[25] DEFECTIVE TRANSPORT OF AMETHOPTERIN (METHOTREXATE) AS A MECHANISM OF RESISTANCE TO ANTIMETABOLITE IN L5178Y LEUKEMIC CELLS [J]. BIOCHEMICAL PHARMACOLOGY, 1962, 11 (DEC) : 1233 - &

[26] ISOLATION AND PARTIAL CHARACTERIZATION OF 3 METHOTREXATE-RESISTANT PHENOTYPES FROM CHINESE-HAMSTER OVARY CELLS [J]. SOMATIC CELL GENETICS, 1976, 2 (03): : 245 - 261

[27] FOLEY GE, 1965, CANCER, V18, P522, DOI 10.1002/1097-0142(196504)18:4<522::AID-CNCR2820180418>3.0.CO

[28] 2-J

[29] QUANTITATIVE-ANALYSIS OF HIGH-RESOLUTION TRYPSIN-GIEMSA BANDS ON HUMAN PROMETAPHASE CHROMOSOMES [J]. HUMAN GENETICS, 1978, 45 (02) : 137 - 165

[30] FRIEDKIN M, 1962, CANCER RES, V22, P600

[21] CRUSBERG TC, 1970, J BIOL CHEM, V245, P5292

[22] DIDDENS H, 1983, CHEM BIOL PTERIDINES, P953

[23] CORRELATION OF DIHYDROFOLATE-REDUCTASE ELEVATION WITH GENE AMPLIFICATION IN A HOMOGENEOUSLY STAINING CHROMOSOMAL REGION IN L5178Y CELLS [J]. JOURNAL OF CELL BIOLOGY, 1979, 83 (02) : 394 - 402

[24] FISCHER GA, 1961, BIOCHEM PHARMACOL, V7, P75

[25] DEFECTIVE TRANSPORT OF AMETHOPTERIN (METHOTREXATE) AS A MECHANISM OF RESISTANCE TO ANTIMETABOLITE IN L5178Y LEUKEMIC CELLS [J]. BIOCHEMICAL PHARMACOLOGY, 1962, 11 (DEC) : 1233 - &

[26] ISOLATION AND PARTIAL CHARACTERIZATION OF 3 METHOTREXATE-RESISTANT PHENOTYPES FROM CHINESE-HAMSTER OVARY CELLS [J]. SOMATIC CELL GENETICS, 1976, 2 (03): : 245 - 261

[27] FOLEY GE, 1965, CANCER, V18, P522, DOI 10.1002/1097-0142(196504)18:4<522::AID-CNCR2820180418>3.0.CO

[28] 2-J

[29] QUANTITATIVE-ANALYSIS OF HIGH-RESOLUTION TRYPSIN-GIEMSA BANDS ON HUMAN PROMETAPHASE CHROMOSOMES [J]. HUMAN GENETICS, 1978, 45 (02) : 137 - 165

[30] FRIEDKIN M, 1962, CANCER RES, V22, P600