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Schematic structure of histidylated oligolysines. HoK1, R = NH3+ (25%), histidylamido (60%) and gluconoylamido (15%); HoK2, R = NH3+ (10%), histidylamido (75%) and acetylamido (15%); HoK3, R = NH3+ (10%), N-acetyl-histidylamido (75%) and acetylamido (15%).
