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"Further, Pfam analysis of protein domain structures confirmed that in addition to the catalytic UCH domain, both USP27X and USP51 have an N-terminal Znf-UBP domain highly similar to that found in USP22, which is critical for USP22 interaction with ATXN7L3 and ENY2 and deubiquitination activity (XREF_FIG and XREF_SUPPLEMENTARY)."