Abstract
Histones were extracted from frog livers and testes and analyzed by electrophoresis on long polyacrylamide gels and on sodium dodecyl sulfate (SDS)-containing polyacrylamide gels. Frog histones were found to be similar to those of calf thymus except that frog histone fraction F2A2 showed a marked dependence on the temperature at which the long gels were run, and frog histone fraction F3 could be separated from frog F2B on SDS-containing gels. Comparisons between frog liver and frog testis histones indicated that the testis contains as its major F1 component a fast migrating species not found in liver. Testis histones also showed less microheterogeneity of fractions F3 and F2A1 than liver histones. These were the only differences observed between liver and testis histones, even when testis histones were prepared from sperm suspensions that were rich in cells in the late stages of spermiogenesis. Thus it seems that, in Rana, the electrophoretic properties of the basic proteins of sperm differ from those of somatic cells only in the nature of histone F1 and in the degree of microheterogeneity of fractions F2A1 and F3.
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