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THE DEVELOPMENT OF RESISTANCE TO METHOTREXATE IN A MOUSE MELANOMA CELL LINE. I: CHARACTERISATION OF THE DIHYDROFOLATE REDUCTASES AND CHROMOSOMES IN SENSITIVE AND RESISTANT CELLSBOSTOCK CJ; CLARK EM; HARDING NGL et al.1979; CHROMOSOMA; DEU; DA. 1979; VOL. 74; NO 2; PP. 153-177; BIBL. 2 P.Article