 
            IndraLab
Statements
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                                  "For example, Oct4 and Sox2 protein levels are regulated by the E3 ligase WWP2, and ubiquitin-specific-processing protease 21 (Usp21) deubiquitinates and stabilizes Nanog, which maintains pluripotency, while FBXW8, an E3 ligase, ubiquitinates and destabilizes Nanog, thereby promoting ESC differentiation."