Effects of proteasome or MMP inhibition on proteasome and collagen I levels in CAMs. Treatment of CAMs with MG132, a specific, potent proteasome inhibitor (A-C) and MMP inhibitor, Bat (D-F) did not change the collagen I content in vehicle or TGF-β stimulated CAMs. Shown are representative Western blot gels (A and D) and the data from densitometric analysis (B, C, E, F) (n=4). * P<0.0.5 compared to vehicle-treated samples.