FBXO32 and muscle atrophy: In the ubiquitin–proteasome system, researchers have found that the expression of the ubiquitin ligases MuRF1 and MAFbx/Atrogin‐1 is stable and highly upregulated in different muscle atrophy models, and TRAF6 also plays an important role in starvation‐induced muscle atrophy.128, 129