...; Mattei et al. 2022; Shang and He 2022). Histone methylation, central to defining chromatin states, distinguishes transcriptionally active euchromatin from repressive heterochromatin. Histone methylation occurs at specific lysine residues of histones H3, H4, and H2B, including H3K4, H3K9, H3K27, H3K36, H4...