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Flow cytometric analysis of NF-κB p65 (pS529) expression by TNF-treated HeLa S3 cells. Cultured cells from the human HeLa S3 (Cervical adenocarcinoma, ATCC CCL 2.2) cell line were starved overnight in Dulbecco's Minimal Eagle's Medium. The cells were harvested and washed with Dulbecco's Phosphate Buffered Saline. They were then either left untreated (dashed line histogram) or treated (37°C, 10 min) with Recombinant Human TNF protein (20 ng/mL; Cat. No. 554618; solid line histogram) and Calyculin A (50 nM; Calbiochem Cat. No. 208851). The cells were fixed (10 min; 37°C) with pre-warmed BD Cytofix™ Fixation Buffer (Cat. No. 554655), permeabilized (30 min on ice) with BD Phosflow™ Perm Buffer III (Cat. No. 558050), and washed twice with BD Pharmingen™ Stain Buffer (FBS) (Cat. No. 554656). The cells were then stained with BD Phosflow™ BV421 Mouse Anti-Human NF-κB p65 (pS529) antibody (Cat. No. 565446). The fluorescence histograms showing NF-κB p65 (pS529) expression were derived from gated events with the forward and side light-scatter characteristics of intact HeLa S3 cells. Flow cytometric analysis was performed using a BD™ LSR II Flow Cytometer System.