Figure 4From: CXCR4 expression heterogeneity in neuroblastoma cells due to ligand-independent regulationEffect of the Secretion Inhibitor Brefeldin A on CXCR4 Surface Expression. Various cell lines from all three surface expression classes were cultured with the addition of 1 μg/ml Brefeldin A. Cells were left at 37°C for 12 hrs, harvested, washed, and processed for FACS analysis. Result represents the M.F.I. +/- SD from three experiments (*P < 0.05, Paired t-test).Back to article page