title: Failure to identify 'thrombocytolysin' (a spasmogenic factor released from platelets immunoreaction) with anaphylatoxin.
abstract: Horse platelets release an unidentified smooth muscle contracting substance after lysis by antiserum and complement. Since the active factor (thrombocytolysin) does not produce tachyphylactic response of the guinea-pig ileum it seems that it is not related to anaphylatoxins.
mesh_terms: D000706:Anaphylatoxins; D000818:Animals; D001681:Biological Assay; D001792:Blood Platelets / Q000032:analysis*; D003165:Complement System Proteins; D006168:Guinea Pigs; D006736:Horses; D007082:Ileum / Q000187:drug effects; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth / Q000187:drug effects; D010455:Peptides
chemical_list: D000706:Anaphylatoxins; D010455:Peptides; D003165:Complement System Proteins