TRIM63 (Tripartite Motif Containing 63): TRIM63 is a protein that plays a crucial role in muscle protein degradation, especially during muscle atrophy. Also known as MuRF1, it targets specific muscle proteins for ubiquitination and degradation within the proteasome. TRIM63 is significant in conditions involving muscle wasting, including cachexia, sarcopenia, and heart failure, and understanding its function may aid in developing treatments for muscle-wasting diseases.