Abstract

1. 1. Although readily hydrolyzed by the alkaline phosphatase of brain, it has been shown that phosphorylcholine, phosphorylethanolamine, phosphorylserine, and phosphorylthreonine are only hydrolyzed very slightly (1.5–6% the rate of splitting of phenyl phosphate) by the acid phosphatase in the brains of man, dog, rabbit, hen, guinea pig, and the rat. 2. 2. A similar relative inactivity toward N-containing phosphate esters of this type has been shown for the acid phosphatases of human kidney, prostate, liver, and intestine. 3. 3. Experiments with inhibitors and activators have not so far yielded evidence of more than one alkaline phosphatase in brain, although they do not exclude this possibility.

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