title: Hexachlorobenzene pesticides and porphyria.
mesh_terms: D001554:Benzene / Q000009:adverse effects; D001555:Benzene Derivatives / Q000097:blood*; D002713:Chlorine / Q000009:adverse effects / Q000097:blood; D004781:Environmental Exposure; D006801:Humans; D007306:Insecticides / Q000097:blood*; D011164:Porphyrias / Q000097:blood*
chemical_list: D001555:Benzene Derivatives; D007306:Insecticides; D002713:Chlorine; D001554:Benzene