<prompt> Both vitamin K and vitamin C are involved inThe synthesis of clotting factorsPost trasnslational modificationAntioxidant mechanismsMicrosomal hydroxylation reactions  <response>: Both vitamin C and vitamin K are required for post translational modificationVitamin C is required for post translational modification of proline lysine in collagen synthesis.Vit K is required for post translational modification of glutamate residue or generation of clotting factors. 