Fig. 2.
Tunicamycin (TM)-induced ER stress and PTP1B in cultured myotubes. Representative western blots (a) and densitometric analysis (mean ± SEM, n=4) of GRP78 (b) and PTP1B (c) protein levels in C2C12 myotubes, incubated with 0.1, 0.5, 1 and 2 μg/ml of TM for 24 h. **p<0.01 compared with non-treated control