Dark-adapted, mixed rod and cone a- and b-wave amplitudes were 24.3 ± 13.5 μV and 52.2 ± 31.7 μV, respectively, in pAAV-hRKP-Tulp1-treated Tulp1−/− eyes with MD at 4 weeks (n = 8; Figure 4). Here, TULP1 is linked to Menkes disease.