Characteristic distribution patterns of voltage-dependent L-type Ca
-channels. Verapamil-FL staining, SIM, S9 to S10B, A, B, C: representative grey-scale images, A´, B´, C´: corresponding pseudocolour images. In S9 (A, A´) and S10A (B, B´) the concentration of labeled Ca2+-channels is considerably higher in tFC, cFC and sFC than in mFC (see scale bar). BC and PC show the highest concentrations of labeled Ca2+-channels in S9. In S10B (C, C´) the ventral side of the FC epithelium exhibits a considerably higher concentration of labeled, i. e. activated, or open, (and inactivated) channels than the dorsal side, where resting, or closed, channels predominate. In D the characteristic distribution patterns are summarized schematically; high concentrations of activated (and inactivated) Ca2+-channels are shown in green (staining in NC is not considered). For abbreviations, see Figure 1.