PEC stimulation increases the number of SLs. (a) Four different sections of AO-stained NK cells. The images were deconvolved to better resolve the AO-labeled SLs. Shown from top to bottom are resting, PEC-activated, and PEC+Gö-(Gö6983), PEC+BFA-, and PMA-treated NK cells. (Scale bar, 5 μm.) (b) Comparison of the total number of SLs under different conditions as those described for a. **, P < 0.01.