endosperm halves from 3-day-old castor bean ( ricinus communis var hale ) were incubated for 30 minutes with l- [ ( 14 ) c ] serine , after which label was observed in ethanolamine , choline , phosphatidylserine , phosphatidylethanolamine , phosphatidylcholine , ethanolaminephosphate , and cdpethanolamine , but not in cholinephosphate or cdpcholine .
C0008405
choline
C0031716
cholinephosphate