Abstract
Incubation of the plasma of many normal human beings with a sesame oil substrate results in a decrease of optical density. This endogenous lipemia clearing activity is rarely found using serum. Clearing is partially inhibited by protamine, by high ionic strengths, by heating at 58[degree]C for 5 minutes, and by cholate. Thus the endogenous clearing factor has many of the characteristics of post-heparin clearing factor. There was no relation of the clearing activity to serum tributyi-nase.

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