TRIM63 and Atrophy: The activation of FOXO3 induces muscle loss as well as protein degradation and stimulates the transcription of the ubiquitin ligases Atrogin-1 and Muscle Ring Finger protein 1 (MURF1), which together with FOXO1 belong to a set of muscle atrophy-related genes (“atrogenes”) that are upregulated in several types of murine muscle atrophy [18,23-25].