Fig. 3. Immunofluorescence of insulin-secreting cells for synaptophysin, SV2A and SV2C isoforms. INS-1E cells (A,C) and primary ß-cells (B,D) were double-stained with an antibody against synaptophysin (SVP38) (green) and with SV2A or -C antibodies (red). The right-hand images represent the overlays of the corresponding green and red channels. Bars, 5 µm.