Abstract
The incorporation in vivo of radioactivity into phospholipid-bound choline has been studied in lobster (Homarus americanus) following intramuscular administration of Na-formate-C14, glycine-2-C14, DL-serine-3-C14, L-methionine-methyl-C14and choline-methyl-C14. Choline and methionine were utilized for formation of phospholipid choline at both metabolic periods of 24 and 72 hours, whereas the other compounds gave only a very limited labelling.When choline-methyl-C14was administered to crab (Cancer magister), after 24 hours 1.9% of the administered radioactivity was found in phospholipid choline and 0.1% in trimethylamine oxide.
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