Abstract
The syntheses of DNA, RNA and protein in the livers of aging mice was studied by electron microscopic radioautography using radioactive precursors. Labeling with3H-thymidine was observed in the nuclei of some hepatocytes at various prenatal and postnatal ages. The percentage of labeled cells decreased after birth, then slowly fell to the lowest value at 2 years. The silver grains with3H-uridine labeling were observed in both the nuclei and cytoplasm of hepatocytes at various ages. There was a peak in uridine labeling at 14 days, and then it slowly decreased until old age. The number of silver grains with3H-leucine labeling in the cytoplasm of hepatocytes was small. It increased after birth, reached the maximum at 1 month, and continued to decrease with aging.
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