We have characterized for the first time the sperm nuclear basic proteins (SNBP) from two species of nemerteans: Cerebratulus californiensis and Cerebratulus lacteus. Gel electrophoretic and chromatographic (RP-HPLC) analysis of the nuclear sperm extracts indicate that histones are the major protein components which are present. The linker histones (histones of the H1 family) exhibit a rather unusual composition and some of them contain cysteine. Several histone H1 isoforms are present, one of which has a composition similar to that of other H1 histones found in the sperm chromatin of other groups of lower invertebrates.
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Wang et al. (2001) studied this question.
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