Cultured cells were lysed in T-PER (Pierce, Rockford, IL) containing a complete mini protease inhibitor cocktail and phosphate inhibitors (Roche, Branchburg, NJ). Tongue mucosa harvested from two individual Tgfbr1flox/flox/Ptenflox/flox mice and two Tgfbr1/Pten 2cKO mice, and five tumors harvested from Tgfbr1/Pten 2cKO mice, were used for Western blot analysis. Detailed procedures for immunoblotting were described as described previously [27 (link), 31 (link), 43 (link)].
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