Protein Expression of Ubiquitin and MAFbx/atrogin-1. Panel A shows the representative Western immunblots of ubiquitin, MAFbx/atrogin-1, and β-tubulin in compressed and control muscles in two pairs of DMSO and MG132 treated animals. The protein expression of ubiquitin and MAFbx/atrogin-1 was determined by Western blot. Data are presented as net intensity x resulting band area and expressed in arbitrary units. Results of ubiquitin (B) and MAFbx/atrogin-1 (C) were normalized to corresponding β-tubulin signal.