On the cover: Confocal image of a human neutrophil undergoing respiratory burst. The characteristically polylobed nucleus (blue) of the neutrophil is surrounded by Rac GTPase (red) and p22^phox (green). The NADPH oxidase complex is assembled and activated intracellularly, shown as regions of yellow, where Rac and p22^phox proteins colocalize. Lacy et al. Divergence of mechanisms regulating respiratory burst in blood and sputum eosinophils and neutrophils from atopic subjects. 2670.)