Fig. 1. A, A stacked confocal fluorescent image of an AC (a), a sketch of the same cell on a schematic background of the retina with marked divisions of 10 strata of the IPL (b), and the light-evoked current responses to a 0.5 sec light step [500 nm, −3.3 (3.3 log unit attenuation)] at various holding potentials (c).CB, Cell body; D, dendrites;R, rod; C, cone; PRL, photoreceptor layer; OPL, outer plexiform layer;INL, inner nuclear layer; GCL, ganglion cell layer. Scale bar, 25 μm. B, Distribution of dendritic stratification levels in the IPL of 164 ACs. These cells are grouped as narrowly monostratified, broadly monostratified, narrowly bistratified, broadly bistratified, narrowly tristratified, broadly tristratified, and diffuse cells (definitions are given in Results). Each vertical column represents an AC, and the short vertical bars in individual strata indicate the presence of dendritic processes in that stratum. TheWD of each of the 164 cells is given at thebottom of each panel in B, as follows: N, Narrow field; M, medium field; W, wide field (definitions are given in Results).