TRIM63 (Tripartite Motif Containing 63): TRIM63 is a protein that plays a key role in muscle protein degradation, particularly during muscle atrophy. Also known as MuRF1, it targets specific muscle proteins for ubiquitination and degradation in the proteasome. TRIM63 is important in conditions of muscle wasting, including cachexia, sarcopenia, and heart failure, and understanding its function may help in developing therapies for muscle-wasting diseases.