Fig. 2.

Details of the tracer coupling pattern of an ON alpha cell in the wild-type mouse retina. A: Camera lucida drawing shows the Neurobiotin-injected ON alpha cell from Figure 1B as well as the array of tracer-coupled amacrine cell somata. B: Same injection as in A; the dendritic architecture of coupled amacrine cells with large somata is highlighted. These amacrine cells typically showed two to three primary dendrites bifurcating relatively close to the soma at right angles. Note that the arbor of the coupled amacrine cell was not completely filled. The soma of the injected cell is depicted as an outline in the figure. C: Composite of drawings in A and B, comparing the arbors of the tracer-coupled amacrine cell processes (gray) and injected ON cell (black). a, axonal process. Scale bar = 100 μm in A (applies to A–C).