IndraLab
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eidos
"Some DUBs recognize and cleave the peptide bond between the C-terminus of ubiquitin and the N-terminus of target proteins as a result of N-terminal ubiquitylation or linear ubiquitin chains21 ( Fig. 1d ) , while other DUBs are restricted to the iso-peptide bonds as a result of the conjugation of ubiquitin to the side-chain residue of ( usually ) lysine at the targeted protein15 ,16 ( Fig. 1d ) ."