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"The interaction between OTUD7B and ERα suggested that ERα might be a substrate of OTUD7B, and therefore we evaluated the possibility of ERα deubiquitylation by OTUD7B. It was found that OTUD7B deletion dramatically decreased ERα protein level, and this effect could be reversed by addition of the proteasome inhibitor MG132 or overexpression of OTUD7B-WT, but not its catalytically inactive mutant OTUD7B C194S (Fig. xref )."