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The COP9 signalosome (CSN)–cullin-RING ubiquitin (Ub)-ligase (CRL) pathway is a prominent segment of the Ub proteasome system (UPS). It specifically ubiquitinates proteins and targets them for proteolytic elimination. As part of the UPS it maintains essential cellular processes including cell cycle progression, DNA repair, antigen processing and signal transduction. The CSN–CRL pathway consists of...