(D–F) The outer nuclear layer of an rd7 mutant retina stained by antibody for S-opsin (red) and rhodopsin (green). The scleral edge of the outer nuclear layer is up. DAPI staining is in blue. (F) shows the merged images. Insets are higher-power images of the outer segments showing non-overlap of S-opsin and rhodopsin staining in the mutant.