Abstract
Post-translational modification of core histones is essential in processes requiring chromatin remodeling. We report here a novel modification in histones of the sperm of the starfish, Asterina pectinfera, which involves an ε-(γ-glutamyl)lysine cross-link between the glutamine residue at position 9 of histone H2B and the lysine residue at position 12 of histone H4.