Effect of selected compounds on fMLF- and IL-8-induced [Ca2+]i mobilization. Human neutrophils were loaded with calcium dye and pretreated with 50 µg/ml FAEOu/s (Panel A), 50 µM sabinene (Panel B), 50 µM geranylacetone (Panel C), 50 µM isobornyl acetate (Panel D), or 1% DMSO (Panels A–D) followed by a second addition of 5 nM fMLF (Panels A and B) or 25 nM IL-8 (Panels C and D). [Ca2+]i mobilization was monitored, as described, and the data are presented as relative fluorescence intensity. Data from two representative experiments are shown.