Western blot analysis of the inhibitor-treated cells was performed using a standardized protocol [35 (link)]. The primary human antibodies used in these analyses included c-MYC, SMO, and β-Actin (Santacruz, CA), AKT, phospho-AKT, S6K, phospho-S6K, GLI1 and SOX2 (Cell Signaling Technology, MA) and, cyclin D1, Bcl-2 and CD133 (BD Biosciences, CA). Immunoreactivity was detected using appropriate peroxidase-conjugated secondary antibodies (Santacruz, CA) and visualized using an enhanced chemiluminescence (ECL) detection system (Pierce, IL).
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