Dendritic morphology of transient ON-OFF RGCs. A: Two adjacent transient ON-OFF RGCs in the visual streak labeled with Neurobiotin following physiological identification. Both cells have densely branched bistratified dendritic trees, with dendrites in the ON sublamina (green) arising from a more dense stratification in the OFF sublamina (magenta). B: High-power image of the boxed area in A, illustrating that the ON arbor (green) is formed from short dendrites (arrowheads) arising from the OFF arbor (magenta). C: The confocal z-projection shown in B is split into three levels: OFF dendrites in blue, ON dendrites in red, and intermediate dendrites in green. This representation emphasizes the steep vertical branching between the OFF and the ON arbors, as evident in the punctate green profiles (arrowheads), which mark transitions between the two arbors. Scale bar = 100 µm in A; 20 µm in B (applies to B,C).