COPS9 (COP9 Signalosome Subunit 9): COPS9 is part of the COP9 signalosome, a complex that regulates protein degradation and is involved in various cellular processes, including cell cycle control, signal transduction, and DNA repair. The COP9 signalosome acts by modulating the activity of the ubiquitin-proteasome system, influencing the stability of a wide range of proteins. COPS9's role in this complex underscores its importance in maintaining cellular homeostasis and its potential involvement in the development of diseases when these processes are dysregulated....