 
            IndraLab
Statements
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                                  "To determine the specific sites of TCF7 protein that are deubiquitinated by USP21, we ranked the predicted ubiquitinated lysine residues of TCF7 conserved in human and mouse by three bioinformatic tools (UbiSite, BDM-PUB, and UbPred), the top four of which (K52, K99, K277, and K406) with high confidence scores were mutated from lysine to arginine (K to R) individually to block the site-specific ubiquitination."