Fig. 1.

Morphologies of the three types of ON-stratifying intrinsically photosensitive retinal ganglion cells (ipRGCs). A: Lucifer Yellow fills of an M2 cell, an M4 cell, and an M5 cell. Due to the large dendritic fields of M2 and M4 cells, the dendritic arbors of the vast majority of these cells extended beyond the field of view of our imaging system. The bright spots around the dye-filled cells are green fluorescent protein signals from the somas of surrounding ipRGCs. B: Sholl's analysis of 94 M2 cells, 37 M4 cells, and 9 M5 cells. The error bars represent SEM.