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Schematic structure of branched HK peptides. H3K4b and H3K4bT: these peptides have a similar DNA-binding domain (R), but H3K4b and H3K4bT differ in that H3K4bT has a histidine-rich tail. H2K4b and H2K4bT: similarly, the difference between H2K4b and H2K4bT is that the latter has a histidine-rich tail.
