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Immunoreactivity of TUNEL staining in the retinal endothelium following radiation and/or hindlimb unloading (HLU). Values are represented as mean density ± SEM for 8 mice/group. a significantly higher than all other groups at the 4-day time point (p<0.05). b Significantly lower than all other groups at the 30 day time point (p<0.05).
