The evolutionary differentiation of two histone H2A.Z variants in chordates (H2A.Z-1 and H2A.Z-2) is mediated by a stepwise mutation process that affects three amino acid residues

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José M Eirín-López, Rodrigo González-Romero, Deanna Dryhurst, Toyotaka Ishibashi and Juan Ausió^*

BMC Evolutionary Biology 2009, 9:31 doi:10.1186/1471-2148-9-31