ERG waveforms from Dog D at ages of 5 months (baseline #1), 8 months (baseline #2), and 10 months (end-stage disease). (A) pure rod, (B) mixed rod and cone, (C) pure cone, and (D) 30 Hz flicker responses all exhibited ERG preservation in the rhTPP1 treated eye relative to the control eye. Baseline #1 and #2 recordings were performed within 1 week prior to intravitreal injections #1 and #2, respectively.