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Immunoreactivity of TUNEL staining in the non-endothelium retinal cells. Quantification of TUNEL immunoreactivity is based on density profile of total TUNEL-positive cells minus the positive for endothelial cells in the retina at 2 weeks after 16O or proton exposure. Values are represented as mean density ± SEM for 8–10 mice/group. a significantly lower than all other irradiated groups (p<0.05).
