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The nucleosomal non-histone phosphoproteins, and phosphoproteins released during the digestion of nuclei by micrococcal nuclease, were studied in three rat liver nuclear populations, namely diploid stromal, diploid parenchymal, and tetraploid parenchymal nuclei, which were separated by zonal centrifugation, in 3-week-old rats in which the parenchymal cells contain diploid nuclei and in 2- and 4-month-old rats with increasing proportions of parenchymal tetraploid nuclei. Qualitative and quantitative differences in nucleosomal phosphoprotein band patterns were found among different types of nuclei and ages. More phosphoprotein bands were found in nucleosomes derived from parenchymal than stromal nuclei. The number of phosphoproteins released during micrococcal-nuclease digestion increased with age for parenchymal nuclei. The significance of these results, considered in conjunction with the increase of DNA repeat length and decrease of nuclease accessibility with age, is discussed.

biochemical journal

The variation with age of nuclear phosphoproteins released during micrococcal-nuclease digestion and nucleosomal phosphoproteins in three cell types from rat liver