title: Arsenic in opium.
mesh_terms: D001151:Arsenic / Q000032:analysis*; D020261:Arsenic Poisoning; D006801:Humans; D009422:Nervous System Diseases / Q000139:chemically induced; D009892:Opium / Q000032:analysis*
chemical_list: D009892:Opium; D001151:Arsenic