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Proteasome-mediated degradation of p27Kip1 in gastric cancer cells. Western blot analysis of p27Kip1, Cyclin E and β-actin in cells 4, 8, 12, and 24 h after treatment with 10-8 mol/L gastrin in the absence or presence of MG132 (5 mmol/L, 15 min pre-treatment and co-treatment with gastrin).
