Figure 1. Expression level of Gpnmb in the retina of the B6 and D2 parental strains, F1 hybrids, and 75 BXD strains. The expression values for each sample were calculated using rank-invariant normalization through the BeadStudio software, and then renormalized using modified Z-scores. The x-axis denotes the strain while the y-axis denotes the expression of the strain mean on a log2 scale. Each bar represents the mean expression values ± standard error of the mean (SEM).