Figure 2. Analysis of maximal pattern electroretinogram (PERG) components in different mouse strains (n=6 for each group). Data have been obtained from measurements of individual waveforms in response to 1 Hz reversing gratings (spatial frequency 0.05 cycles/degree, contrast 1.0). A: Mean amplitude of the positive peak with latency around 100 ms (P100) component. B: Mean amplitude of the negative trough with latency around 250 ms (N250) component. C: Mean latency of the P100 component. In all panels, the error bars represent the standard error of the mean. Brackets superimposed to adjacent bars represent statistical comparisons (p value, t test) between means of C57BL/6J (B6) and DBA/2J (D2) and between means of DBA/2J (D2) and DBA/2J.Gpnmb⁺. The level of statistical significance is also marked with one asterisk (*) if p<0.05 and two (**) if p<0.01.