Abstract
Though there are several assay methods for the kallikreins, there are neither standard units nor standard methods. The representative activities of kallikreins, such as the vasodilator, kinin forming and esterolytic activities, were determined by various methods on hog pancreatic, human salivary, urinary and plasma and guinea pig coagulating gland kallikreins and also on trypsin. Some enzymatic properties of these kallikreins were discussed from comparison of their activities, and the procedures of these assay methods were also examined in detail.
