title: Letter: Comments of the activation of Hageman factor (factor XII) by collagen.
mesh_terms: D001777:Blood Coagulation / Q000187:drug effects; D003094:Collagen / Q000494:pharmacology*; D004789:Enzyme Activation; D005174:Factor XII / Q000378:metabolism*; D006801:Humans; D011485:Protein Binding; D013997:Time Factors
chemical_list: D005174:Factor XII; D003094:Collagen