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Additional supporting information may be found in the online version of this article.

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CNE_22586_sm_suppinfofigure1.tif1705KSupporting Figure 1: (Magenta green version of Figure 7 for the assistance of color blind readers.) Micrographs of double and triple labeled preparations showing excitatory and inhibitory input to retrogradely labeled ganglion cells. Single images of a stack of images taken with a deconvolution microscope are shown. A: Dendrites of a broad thorny cell together with C-terminal binding protein (CtBP2) immunoreactive puncta (IR, bipolar input). B: Dendrites of a large sparse cell together with gephyrin immunoreactive puncta (amacrine input). The arrows indicate colocalized IR puncta. Scale bar shown in A = 2 μm (also valid for B). C, D and F - H: Dendrites of a broad thorny cell together with IR puncta showing bipolar (AMPA receptor subunit GluR4) and amacrine (gephyrin) input. Open arrows indicate colocalized gephyrin IR puncta; filled arrows indicate GluR4 IR puncta. Scale bar shown in H = 2 μm (also valid for C, D, F, G). E: Reconstruction of the entire dendritic section (grey). Colocalized gephyrin IR puncta are shown in purple, colocalized GluR4 IR puncta are shown in green.
CNE_22586_sm_suppinfofigure2.tif5562KSupporting Figure 2: (Magenta green version of Figure 10 for the assistance of color blind readers.) Relationship between a large sparse ganglion cell and DB6 axons terminals. A- C: Dendrites of a large sparse cell together with CD15 labeled axon terminals of DB6 bipolar cells. The arrows indicate presumed contact areas. Scale bar shown in C = 2 μm also valid for A and B. D: Tracing of a large sparse cell at 4.4 mm eccentricity together with the axon terminals of CD15 labeled DB6 bipolar cells. In total 26 DB6 axon terminals are located in the dendritic field of this ganglion cell and 22 axon terminals overlap with its dendrites. Scale bar = 20 μm. E: Potential contact areas as detected in three-dimensional space are shown by circles for the boxed area indicated in D. A magenta-green version of this figure is supplied in the supplementary material (Figure 2).

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