Bovine H10 histone subfractions contain an invariant sequence which matches histones H5 rather than H1

Histone H10 differs substantially from H1 in a 37-residue region of the primary structure that is conserved between the usual H1 histones of fish and mammals. Instead, H10 is homologous to H5 in this region. Histones H10 and H5 might be classified together in a histone category distinct from the usual H1.