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The ratios of total histone to DNA for rat liver nuclei isolated by four methods as well as for calf liver nuclei isolated by one method were determined by obtaining the ratios of the total areas of the electrophoretic histone peaks for the liver nuclei to the corresponding total area given by a known amount of standard calf thymus histone. Ratios of total histone to DNA of approx. 2 for rat liver nuclei isolated at pH3.8 or 5.8 and for calf liver nuclei isolated at pH3.8 were confirmed twice by the above procedure and also by direct measurement, by the method of Lowry et al. (1951), of histone extracted in 0.2m-H(2)SO(4). The histones of calf thymus, calf liver and rat liver were characterized by their amino acid compositions and by polyacrylamide-gel electrophoresis.

High total histone/deoxyribonucleic acid ratios for rat liver nuclei