Morphology and tracer coupling patterns of the G14 and G15 ganglion cell subtypes in the mouse retina. A,B: Pair of photomicrographs show a G14 cell (asterisk) with dendrites stratifying in the middle of the IPL. This G14 cell shows no evidence of tracer coupling. C–E: Photomicrographs show a G15 cell (asterisk) with focal depth on the GCL (C), on the IPL in (D), and on the INL (E). Arrow points to one of the wavy dendrites of this cell in panel D, whereas arrows point to somata of heterologously coupled amacrine cells in the INL in panel E. a, axon. Scale bars = 100 μm.