Abstract

In addition to the usual major Hl sub-fractions, a “satellite” histone Hl s, similar in amino acid composition and molecular weight to mammalian Hl o, is present in both liver and erythrocyte nuclei of Xenopus laevis and Rana catesbeiana (as in freshwater turtles), but no erythrocyte-specific histone resembling the H5 of birds and some fish was found. Such lysine-rich satellite histones may share functional homologies while displaying tissue-specific variations in composition.

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