title: Photoaffinity analogues of methotrexate as probes for dihydrofolate reductase structure and function.
mesh_terms: D000345:Affinity Labels / Q000494:pharmacology*; D005493:Folic Acid Antagonists; D008727:Methotrexate / Q000031:analogs & derivatives* / Q000494:pharmacology; D010777:Photochemistry; D013329:Structure-Activity Relationship
chemical_list: D000345:Affinity Labels; D005493:Folic Acid Antagonists; D008727:Methotrexate