title: An unidentified serum factor with smooth muscle stimulating properties.
mesh_terms: D000818:Animals; D001920:Bradykinin / Q000494:pharmacology; D006168:Guinea Pigs; D006632:Histamine / Q000494:pharmacology; D007082:Ileum; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth; D010455:Peptides / Q000097:blood* / Q000494:pharmacology; D011817:Rabbits; D013268:Stimulation, Chemical
chemical_list: D010455:Peptides; D006632:Histamine; D001920:Bradykinin