title: Diagnosing porphyria using magnetic circular dichroism.
mesh_terms: D005243:Feces / Q000032:analysis; D006801:Humans; D008722:Methods; D011164:Porphyrias / Q000175:diagnosis*; D011166:Porphyrins / Q000032:analysis / Q000652:urine
chemical_list: D011166:Porphyrins