title: Proceedings: Variations in the histamine content of 'Ascaris suum'.
mesh_terms: D000818:Animals; D001200:Ascaris / Q000032:analysis* / Q000187:drug effects; D006632:Histamine / Q000032:analysis*; D007422:Intestines / Q000469:parasitology; D010879:Piperazines / Q000494:pharmacology; D013552:Swine
chemical_list: D010879:Piperazines; D006632:Histamine