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Neuronal number is maintained in old retina. Retinas from young adult and old mice were dissociated, stained with antibodies, and analyzed by flow cytometry. A, Total number of cells per retina. B, Flow cytometry histogram of PKCα+ neurons. P2 indicates the positive population. FSC, Forward scatter. C, Number of neurons per retina for major neuronal types. Bars show the mean ± SEM of values from five experiments.
