Abstract
Abstract 1. 1. Histones were isolated from plutei larvae of the sea urchin Tetrapygus niger and analysed electrophoretically. Individual histones were purified and their amino acid compositions were determined. 2. 2. The electrophoretic analysis revealed that larval histones are microheterogeneous; H1 exhibits four subforms, the nucleosomal core histones H2A, H2B and H3 were resolved into three subforms each and H4 had two subforms. 3. 3. The comparisons of the amino acid compositions of plutei larvae histones with data from the literature of homonimus late variants isolated from gastrulas of other sea urchin species, indicate that late histone variants are conserved proteins with a very slight degree of species specificity and with general features of classical histones.
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