Abstract
Rat, horse, and human plasma had powerful inhibitory action on the proteolytic activity of skin extracts. The inhibitory factor was unstable at 65[degree], rapidly destroyed at 70[degree] and by shaking with CHCl3. The activity was retained after 5 hr. dialysis against 1% NaCl (at 1 [degree]). Trichloracetic acid partly inactivated and partly precipitated the inhibitory factor in the active state from plasma. The inhibitor from plasma was precipitated in the most soluble fraction of the albumin, but was not a property of the total albumin. Trypsin inhibitor from pancreas had no effect on skin protease.

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