Fractions enriched in neuronal and glial cells from rat brain were assayed for their ability to incorporate 14C-labeled serine, ethanolamine, and choline into lipids in vitro. It was found that these precursors were incorporated into their respective phospholipids by mainly a simple non-energy-dependent, Ca+2-requiring reaction rather than by de novo synthesis.
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Raghavan et al. (1972) studied this question.
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