Figure 2. Duplication in GPR143 identified in subject family with congenital nystagmus. A: The sequence for a normal individual shows the wild-type allele. B: The sequence for the patient (IV:3) shows the 19-bp (c.291_309) duplication identified in exon 1. We can see that the end part of the duplicated base pairs is the same with the one just ahead of the duplication (shown in the rectangle).