The turnover of nuclear and chromatin lipids from the liver and thymus of control and irradiated rats was studied by the incorporation of [14C]acetate. The chromatin-bound lipids were shown to possess a high metabolic activity which was especially well-pronounced in thymus cells. The higher specific radioactivity of the chromatin-bound lipids in comparison with that of intact nuclear lipids points to the structural uncoupling of chromatin lipids from other nuclear lipids.

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