Abstract

An enzyme activity which catalyzed the deacetylation of histone was found in the calf thymus extract. 14C-Acetyl-histone prepared by incubating calf thymus nuclei with sodium 14C-acetate served as the substate and treatment of the histone with pronase destroyed most of the susceptibility to the enzymatic deacetylation. 14C-Acetyl-histone prepared by chemical acetylation with 14C-acetic anhydride served as the substrate to a less extent.

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