Abstract

Radioactive phosphate and sulfate were injected into neonatal rats. Most of the persistent radioactivity was found in the lipids of the brain nritochondria, but this fraction also probably contained myelin. In other experiments P/sup 32/ as phosphate was injected into neonatal and adult rats and a myelin-enriched fraction isolated from the brain. Relatively more radioactive lipid was found in the myelinenriched fraction from the brains of neonatal rats than in the rest of the brain lipid. In contrast less radioactive phospholipid was obtained from the myelin-enriched fraction from adult rats than from the remaining brain lipid. (auth)

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