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Isolated rat hepatic nuclei were shown to contain poly(A) polymerase in two distinct physiologically active forms. One form was associated with the chromatin fraction and was dependent on endogenous RNA, presumably mRNA. The other activity was localized in the nuclear sap in a 'free' form and was stimulated almost 30-40-fold by exogenously added poly(A). Isolated nucleoli were devoid of significant poly(A)-synthesizing activity.

Chromatin-bound and free forms of poly(adenylic acid) polymerase in rat hepatic nuclei