Comparison of the ultrastructure of the outer retina of a wild-type mouse (A, C) and a cd81−/− mouse (B, D) reveals similar structure of the junctional complexes cells. No differences were observed in the junctional complexes between RPE cells (arrows in A and B) or in the basal enfolding of the RPE (double asterisks). At the outer limiting membrane there was no observable difference between the two groups of mice with respect to the junctional complexes between Müller cells (arrows in C and D).A and B are at the same magnifications (20,000×), as are C and D (10,000×).