Figure 5. Electroretinogram (ERG) of the normal and affected members of the families RP26 and RP44. The photopic ERGs (A, C) of the unaffected individuals (RP26_IV:2, RP44_IV:6) of families RP26 and RP44 indicated normal cone responses. In comparison, the affected individuals (RP26_V:2, RP44_IV:1) of both families had residual cone responses (B, D).