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Surface Toll-like receptor 9 (TLR9) staining of B lymphocytes of a severely injured patient prone to sepsis. (a) Scatter diagram of leucocytes in lysed whole blood. R1: lymphocyte region; (b) B lymphocyte (CD19+) staining with the second antibody using R1. Q2 labels the interesting quadrant. (c) B lymphocyte (CD19+) staining with a TLR9 antibody of the BioCarta company using R1. Q2 quadrant shows TLR9+ B lymphocytes.
