title: Introduction to the porphyrias.
mesh_terms: D002722:Chlorobenzenes / Q000633:toxicity*; D006581:Hexachlorobenzene / Q000633:toxicity*; D006801:Humans; D011164:Porphyrias / Q000139:chemically induced / Q000378:metabolism*
chemical_list: D002722:Chlorobenzenes; D006581:Hexachlorobenzene