A. P4 β-gal reaction product is localized as discrete puncta in the GCL and in cell bodies in the proximal INL. Faint labeling of the OPL is present.
B. P10 β-gal reaction product reveals an increase in the number of somata in the proximal and distal INL and in the GCL. Scale = 20μm.
OPL = outer plexiform layer, INL = inner nuclear layer, IPL = inner plexiform layer, GCL = ganglion cell layer.