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Schematic structure of unmodified and modified bHKP. The unmodified peptides consist of four histidine-lysine branches originating from the lysine core. The HK branches contained KHKHHKHHKHHKHHKHHKHK for H2K4b or KHHHKHHHKHHHHKHHHK for H3K(H)4b. Modified HK were similar except that PEG-cRGD conjugates were added randomly to the branches.
