title: Letter: "Active sites" on platelet membranes.
mesh_terms: D001665:Binding Sites; D001792:Blood Platelets / Q000648:ultrastructure*; D002462:Cell Membrane / Q000648:ultrastructure; D006801:Humans; D010974:Platelet Aggregation; D011554:Pseudopodia / Q000648:ultrastructure; D013917:Thrombin / Q000378:metabolism
chemical_list: D013917:Thrombin