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Posttranslational modifications of the N-terminal region of histone H4. The majority of the known histone modifications affect the amino acids that make up the unstructured N-terminal region of the histone core protein. Covalent modifications of the human H4 histone protein include phosphorylation (P), acetylation (Ac), and methylation (Me). Single letter abbreviations for amino acid residues: A = alanine; G = glycine; H = histidine; K = lysine; L = leucine; R = arginine; S = serine.
