Confocal image of light-adapted, triple-labeled inferior retina with G0α (green), PKCα (blue), and Glycine (red). A: Noncoupled ON cone bipolar cells have been identified (G0α positive, PKCα negative, and glycine negative), labeled with an asterisk (43 cells, 21.3%). B–D: Same as in Figure 1, but glycine is red. Scale bar = 20 μm in A; 5 μm in B–D.