RT Journal Article SR Electronic T1 Properties of dihydrofolate reductase from a methotrexate-resistant subline of human KB cells and comparison with enzyme from KB parent cells and mouse S180 AT/3000 cells. JF Molecular Pharmacology JO Mol Pharmacol FD American Society for Pharmacology and Experimental Therapeutics SP 231 OP 238 VO 21 IS 1 A1 B A Domin A1 Y C Cheng A1 M T Hakala YR 1982 UL http://molpharm.aspetjournals.org/content/21/1/231.abstract AB