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"Similarly, Atanassov et al recently reported that depletion of USP22, a major H2B DUB, not only failed to increase H2Bub1 levels but even caused a mild decrease; this was ascribed to the fact that two newly identified H2B DUBs, USP27X and USP51, compete with USP22 for binding to the SAGA complex adaptor proteins ATXN7L3 and ENY2 XREF_BIBR."