feG and the binding of different antibodies to CD16b. The dose response relationship for the binding of two different antibodies against CD16b, the 1D3 and LNK16 clones, to human neutrophils. The percent change in MFI relative to PAF (10-9M) is plotted against dose of feG. Data presented as mean ± SEM for n = 6–8. Statistically significant differences (*P < 0.05) from no peptide (0).