Abstract
The acid-soluble proteins from the sperm of several species of echinoderms are described. All of them are analogous to calf thymus histones, as judged by their amino acid composition, although some minor differences appear. The electrophoretic pattern is very similar for organisms belonging to the same class, but it differs among the four classes of echinoderms studied. Three to five bands appear on polyacrylamide gel electrophoresis. Two of them (γ and δ) are present and have similar mobilities for all the species studied and for calf thymus, but their relative intensity varies. On the other hand, the additional bands differ in mobility among the four classes studied.
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