Fig. 1. 5-HT3A-positive nerve fibers innervate Type III, but not Type II, taste cells in all taste fields.
A: Single optical sections of taste buds with 5-HT3A GFP (green), 5-HT (red; Type III cell marker) and GNAT3 (blue; Type II cell marker) immunoreactivity. B: The same image from A after threshold and binarization.