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The polypeptides present in 35S-labelled chromatin prepared from Escherichia coli cells, and polypeptides present in the DNA and RNA complexes obtained by micrococcal nuclease digestion of the chromatin, were analysed by two-dimensional non-equilibrium polyacrylamide gel electrophoresis. Three hundred and thirty-five 35S-labelled polypeptides were detected in the chromatin whereas the DNA- and RNA-containing fractions of the micrococcal nuclease digest contained 126 and 183 polypeptides respectively. The major basic low-molecular-weight polypeptides were found in the DNA-containing fractions.

Two-dimensional Gel Electrophoretic Separation of the Proteins Present in Chromatin of Escherichia coli