| H3 | histone H3 |
| H4 | histone H4 |
| me1 | mono-methylated histones |
| me2 | di-methylated histones |
| me3 | tri-methylated histones |
| H3K9me1/me2/me3 | histone H3 methylated on lysine 9 (mono-; di-; tri-methylation) |
| H3K9ac | histone H3 acetylated on lysine 9 |
| HDAC | histone deacetylases; HDAC1: histone deacetylase 1 |
| HDACi | histone deacetylase inhibitors |
| Kac | lysine acetylation |
| PTM | post-translational modification |
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