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ERG responses of opn4-/- and WT mice. (A) Light-adapted ERGs measured in a steady background of 2.5 log scotopic troland, sufficient to saturate the rod response. (B) Intensity–response relations for the light-adapted b-wave. The b-wave amplitude was measured at 45 msec after the flash, when the positive-going wave was maximal over most of the stimulus range (see A). The eight WT mice indicated included seven C57BL6 animals, owing to the reduced sample of WT B6/129 mice.
