Incorporation of P 32 into the O-Phosphodiester of L-Serine and Ethanolamine in the Turtle. ∗

Abstract

Summary

1. It was shown that intracardially administered P³² orthophosphate is incorporated into O-phosphodiester of L-serine and ethanolamine (SEP) and ethanolaminephosphate (EP) in tissues of the turtle. 2. Kidney and heart showed highest degree of labeling of SEP and EP. White and red muscle exhibited smallest uptake of P³² into SEP, although containing larger amounts of this compound than other tissues examined. 3. Only incubation of intact erythrocytes in plasma for prolonged periods, of a variety of in vitro systems tested, gave any evidence of P³² incorporation into SEP.