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Histones are the predominant protein component of chromatin and are subject to a variety of post-translational modifications. Of these, acetylation of the amino-terminal tails of core histones is most intensively studied and is linked to chromatin assembly, the regulation of gene expression, cell cycle progression and cellular transformation (
1
). Characterization of the enzymes responsible for histone acetylation provides a handle for directly studying such histone modifications in these processes. Two classes of histone acetyltransferases (HATs) have been described; cytoplasmic type B HATs acetylate free histones for subsequent assembly into chromatin (
2
) and nuclear type A HATs, which mediate transcription related acetylation of chromosomal histones (
3
).