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Analysis of S6 (pS235/pS236) in activated human peripheral blood mononuclear cells (PBMC). PBMC were isolated by density gradient centrifugation (Ficoll-Paque™ PLUS, Cat. No. 17-1440-02) and either left untreated (open histogram) or treated with PMA (Sigma-Aldrich, Cat. No. P8139) at 50 nM/10^6 cells for 30 minutes (shaded histogram). Cells were then fixed in BD Cytofix™ buffer (Cat. No. 554655) at 37°C for 10 minutes, then permeabilized with BD Phosflow™ Perm Buffer III (Cat. No. 558050) on ice for at least 30 minutes, and then stained with Alexa Fluor® 488 Mouse anti-S6 (pS235/pS236). For data analysis, lymphocytes were selected by scatter profile. Flow cytometry was performed on a BD FACSCalibur™ flow cytometry system.
Western blot analysis of S6 (pS235/pS236). The specificity of mAb N7-548 was confirmed by western blot analysis using unconjugated Mouse anti-S6 (pS235/pS236) antibody on lysates from untreated (lane 1) or PMA-treated (lane 2) PBMC. S6 (pS235/pS236) is identified as a band of 32 kDa, with increased intensity in the PMA-treated cells. Purified Mouse anti-Actin monoclonal antibody (Cat. No. 612656 or 612657) was the gel-loading control.