The kininogen level in saliva was measured by radioimmunoassay, and the kallikrein activity was determined by an enzymatic method with D-Val-Leu-Arg-p-nitroanilide. The kininogen level in the Periodontally-diseased Group was remarkably high compared with that of the Periodontally-healthy Group, but the kallikrein activity was approximately the same in the two groups.
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