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- [4] THE EFFECTS OF SUBSTITUTION OF AN INVARIANT TRYPTOPHAN RESIDUE TO PHENYLALANINE ON THE ENZYME FUNCTION OF HUMAN DIHYDROFOLATE-REDUCTASE (HDHFR) FASEB JOURNAL, 1988, 2 (05): : A1331 - A1331
- [6] METHOTREXATE RESISTANT VARIANTS OF HUMAN DIHYDROFOLATE-REDUCTASE - EFFECTS OF PHE31 SUBSTITUTIONS FASEB JOURNAL, 1993, 7 (07): : A1069 - A1069