Figure 2. Proton-induced X-ray emission (PIXE) microanalysis of zinc and copper in 2-, 3-, and 4-week-old rd10 and wild-type mouse retinas. Concentrations of zinc (A) and copper (B) in μg/g dry weight, correspond to photoreceptor segments area from 2-, 3-, and 4-week-old rd10 and wild-type (WT) mouse retinas. The white bar represents WT mice and the black bar rd10 mice. Values were means±SEM (n=4–7; p<0.05, ** p<0.01, *** p<0.001; ns: not significant).