1. 1. A stable DNA-protein complex resistino all treatments dissociating noncovalently associated proteins was isolated from mouse erythroleukemia cells. 2. 2. Two-dimensional tryptic peptide mapping of this DNA-linked protein component revealed a remarkable similarity to the maps of the corresponding proteins from other mammalian chromatins. 3. 3. Labelling experiments showed that the protein component was metabolically stable.
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