<unk>  is an epigenetic modification to the DNA packaging protein Histone H3. It is a mark that indicates acetylation of the lysine residue at N-terminal position 27 of the histone H3 protein.<unk>  is associated with the higher activation of transcription and therefore defined as an active enhancer mark.<unk>  is found at both proximal and distal regions of transcription start site (TSS).
H3K27ac
H3K9ac
H3K14ac
H4K8ac
H4K12ac
H3K23ac
H4K5ac
H4K91ac