although we confirmed that hmw kininogen , bovine serum albumin , fibrinogen , cold insoluble globulin , and mixed phospholipids apparently increased prekallikrein activation , we found that the product of prekallikrein activation ( kallikrein ) lost substantial activity in less than 0.5 min after exposure to a variety of fresh surfaces .
C0033024
prekallikrein
C0022478
kallikrein