Abstract
Summary
Purified preparations of the glycoprotein found in human placental fluid that inhibits the hemagglutination of H-1 and HB viruses, have also been shown to contain alkaline phosphatase activity. This phosphatase activity has been identified as a placental phosphatase by comparing its characteristic behavior with that of purified human placental alkaline phosphatase. It is probable that the viral inhibitor and the large molecular-weight variant of placental alkaline phosphatase are the same glycoprotein.
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