Distribution and morphology of microglial cells in Sprague-Dawley (SD) (A) and P23H (B) rats. Retinal vertical sections were immunolabeled with CD11b (OX-42). Note the presence of amoeboid CD11b-positive cells in different layers of the P23H rat retina, including the subretinal space. GCL, ganglion cell layer; IPL, inner plexiform layer; INL, inner nuclear layer; OPL, outer plexiform layer; ONL, outer nuclear layer. Scale bar: 10 μm.