<prompt> Which is not involved in local hemostasisFibrinogenCalciumVit kCollagen  <response>: Ref Robbins 9e p118-119 Vitamin K serves as an essential cofactor for a carboxylase that catalyzes carboxylation of glutamic acid residues on vitamin K-dependent proteins. The key vitamin K-dependent proteins include: Coagulationproteins: factors II prothrombin, VII, IX and X 