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Bromodomain, ALL-1 like proteins. ALL-1 is a vertebrate homologue of Drosophila trithorax and is often affected in chromosomal rearrangements that are linked to acute leukemias, such as acute lymphocytic leukemia (ALL). Bromodomains are found in many chromatin-associated proteins and in nuclear histone acetyltransferases. They interact specifically with acetylated lysine.