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The quantitative changes of a group of non-histone chromosomal proteins identified by its solubility, electrophoretic mobility and amino acid analysis as the high mobility group proteins HMG1 and HMG2, were studied throughout rooster spermatogenesis. The ratio HMG1/HMG2 remained constant (0.66 +/- 0.04) during the transition from dividing meiotic and premeiotic cells to nondividing spermatids and...
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