Bromodomains are 110 amino acid long domains, that are found in many chromatin associated proteins. Bromodomains can interact specifically with acetylated lysine [3].

1: The bromodomain: a conserved sequence found in human, Drosophila and yeast proteins. Haynes SR, Dollard C, Winston F, Beck S, Trowsdale J, Dawid IB; Nucleic Acids Res 1992;20:2603-2603. PMID:1350857

2: The bromodomain revisited. Jeanmougin F, Wurtz J-M, Le Douarin B, Chambon P, Losson R; Trends Biochem Sci 1997;22:151-153. PMID:9175470

3: Structure and ligand of a histone acetyltransferase bromodomain. Dhalluin C, Carlson JE, Zeng L, He C, Aggarwal AK, Zhou MM; Nature 1999;399:491-496. PMID:10365964