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Expression of surface receptors after exposure to no gradient, fMLP gradient, CXCL8 gradient, and a CXCL8-fMLP competing gradient (denoted as 8-fMLP). (a) FPR2 expression in untreated (green) and p38 MAPK-blocked (blue) neutrophils. (b) BLTR expression in untreated (green) and p38 MAPK-blocked (blue) neutrophils. (c) CXCR1 expression in untreated (green) and p38 MAPK-blocked neutrophils.
