Fig. 3. A cryostat section across the outer retina of a transgenic fish showing GFP (left), anti-rhodopsin immunoreactivity (middle), and the co-localization of GFP and rhodopsin (right). GFP was found in the soma (arrowheads) and inner segment (arrow with broken line) of rod photoreceptor cells. The antibody labeled rhodopsin in the inner (arrow with broken line) and outer (arrow with solid line) segments. The merged image shows the co-localization of GFP and rhodopsin. Scale bar, 40 µm.