Abstract
It was shown that intra-cardially administered P32 orthophosphate is incorporated into O-phos-phodiester of L-serine and ethanolamine (SEP) and ethanolaminephosphate (EP) in tissues of the turtle. 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. 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.

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