H3K9me3
H3K9me3 is the covalent modification of histone protein. The repeat-rich regions of constitutive heterochromatin are enriched by dimethylation and trimethylation of histone 3 lysine 9 (H3K9me2 and H3K9me3).[1]
Nomenclature
H3K9me3 means trimethylation of lysine 9 on histone H3 protein subunit:
| Abbr. | Meaning |
| H3 | H3 family of histones |
| K | standard abbreviation for lysine |
| 9 | position of amino acid residue (counting from N-terminus) |
| me | methyl group |
| 3 | number of methyl groups added |