title: Effect of oral contraceptives on erythrocytic porphyrins.
mesh_terms: D003276:Contraceptives, Oral / Q000494:pharmacology*; D004912:Erythrocytes / Q000032:analysis / Q000187:drug effects*; D005260:Female; D006801:Humans; D011166:Porphyrins / Q000097:blood*
chemical_list: D003276:Contraceptives, Oral; D011166:Porphyrins