title: Histone gene heterogeneity in the sea urchin Strongylocentrotus purpuratus.
mesh_terms: D000818:Animals; D005075:Biological Evolution; D005796:Genes; D006657:Histones / Q000235:genetics*; D012617:Sea Urchins / Q000196:embryology / Q000235:genetics*
chemical_list: D006657:Histones