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Acetyltransferase is a type of transferase enzyme that transfers an acetyl group, such as histone acetyltransferases (HATs), choline acetyltransferase, chloramphenicol acetyltransferase and serotonin N-acetyltransferase. Among them, histone acetyltransferases (HATs) are the most important. These enzymes play a critical role in epigenetic regulation of gene expression.