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We have investigated the distribution of tissue-specific tightly bound non-histone proteins in the first and third levels of chromatin organization. The proteins of this class have been extracted from whole chromatin and chromatin fractions prepared from pig liver or kidney. The tissue-specific proteins have high molecular mass (ranging from 135 KDa to 70 KDa in liver, over 135 KDa in kidney) and in kidney a more basic isoelectric point. These proteins are mainly located outside the core particles, and are instead present only in the chromatin matrix, become more intense after extensive digestion of the matrix with DNAase I.
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