title: Erythropoietic protoporphyria.
authors: M M
authors: MM
authors: Mathews-Roth
mesh_terms: D018592:Cross-Over Studies; D003545:Cysteine / Q000627:therapeutic use*; D004311:Double-Blind Method; D006801:Humans; D017121:Porphyria, Hepatoerythropoietic / Q000188:drug therapy*
chemical_list: D003545:Cysteine