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"Our data indicate physical interaction between USP22 and FoxM1 is required for USP22-mediated suppression of FoxM1 ubiquitination, because mutation of cystines 61 and 63, which disrupts the zinc finger structure and its interaction with FoxM1 (Fig. 3I), totally abolished USP22 activity in suppressing FoxM1 ubiquitination (Fig. 3G)."