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"According to a previous study by Iyengar [XREF_BIBR], Akt promotes USP4 to enter the cell membrane and cytoplasm to phosphorylate USP4 and regulate its subcellular localization, and Akt phosphorylation of USP4 occurs by combining with other de-ubiquitinating enzymes (DUBs) to de-ubiquitinate the TGF-beta receptor [XREF_BIBR]."