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"At the same time, the detection of various ubiquitination-related proteins, including PTEN ubiquitination inhibitory proteins USP7 [36] and USP13 [37] and PTEN ubiquitination-promoting protein NEDD4-1 [38], WWP1 [34], WWP2 [39] and FBXO22 [35], showed that only WWP1 and FBXO22 were significantly down-regulated, while others were not significantly changed (Fig. 4e)."