Figure 1. Electroretinograms (ERGs) were recorded from 6-week old tg21 animals (blue tracings) and C57BL/6 WT mice (black tracings) in response to 0.47 log cd∙s/m² strobe flashes presented under dark-adapted (left) or light-adapted (right) recording conditions. In comparison to the wild type (WT) response, the b-wave component is markedly reduced in tg21 mice.