<prompt> Vitamin k associated clotting factors are9,101,57,81,81  <response>: Ref Robbins 8e 118-119 ; 9e p 119 Physiologic Effects of Vitamin K 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. 