Figure 10: Mouse diaphragm muscle chymotrypsin-like proteasome activity following 8 hours of exposure to normoxia (control) or hypoxia. Chymotrypsin-like proteasome activity in diaphragm muscle (mean ± SEM) expressed as a rate of AMC tag release from peptide substrate (pmol/min/mg of protein) following exposure to either normoxia (control; FiO2 = 0.21) or hypoxia (FiO2 = 0.10); per group. There was no significant difference between the two groups (unpaired t test).