Fig. 4.
Effect of cholera toxin on cell-cycle regulatory molecules. C6 cells were incubated with 0, 5, 7.5, or 10 ng/ml cholera toxin for 48 h. Total protein was extracted and blotted with antibodies against cyclin D1, Cdk2, p21cip1, and p27kip1. Blots are representative of three independent experiments.