Fig. 2. Receptor cells in taste buds of juvenile trout. (A) A receptor cell from a taste bud in the vomer, stained with L-cysteine (100 mmol l^–1) + FM1-43 (1 µmol l^–1). The taste bud was exposed for 30 s and fixed with paraformaldehyde in 0.1 mol l^–1 phosphate buffer. (B) A taste bud on the tongue with three sensory cells stained with L-cysteine (100 mmol l^–1) + FM1-43 (1 µmol l^–1; 5 min). The images are z-projections taken using a fluorescence microscope with 2.5 µm distance, stack parameter `max intensity' and processed with ImageJ. The scale bar is for both images.