Figure 5. Rod bipolar cell axonal ribbons cannot drive M1 ipRGCs.

All 63 rod bipolar cells (ghosts) with axonal ribbons in RC1 are displayed against ipRGC 12208 (sand). Note that all ribbon synapses (bright green dots), including the axonal ribbons, are too proximal in the IPL to form synapses with the ipRGC. Scale bar, 20 μm.