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The incorporation of [Me‐14] choline administered by intraventricular injection in vivo into the phosphatidyl choline of the membranes of rat cerebral cortex was studied, and it was demonstrated that the radioactive choline was incorporated almost exclusively into phosphatidyl choline in each of the fractions. The various membranous fractions had different half‐lives of phosphatidyl choline. The half‐life of the phosphatidyl choline of myelin was 167 days, the longest of any fraction, while the value of 27 days for mitochondria was the shortest. Phosphatidyl choline of microsomal membranes and synaptic vesicles had very similar half‐lives, whereas the purest fraction of nerve ending membranes gave a half‐life double that of synaptic vesicles.
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Lapetina et al. (1969) studied this question.
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