title: Heparin activity in systemic mastocytosis.
mesh_terms: D002648:Child; D006471:Gastrointestinal Hemorrhage / Q000209:etiology; D006493:Heparin / Q000097:blood*; D006801:Humans; D008297:Male; D014582:Urticaria Pigmentosa / Q000097:blood*
chemical_list: D006493:Heparin