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Measurement of the RBC flow velocities in the retinal vessels in mice during aging. (a, b) RBC flow velocity in the retinal vessels of the artery, vein, and capillary measured at different ages in two mice strains, (a) C57BL/6 and (b) Balb/c. Symbols and shades represent the mean value and standard deviation, respectively. The number of mice was 3 for every time point except for 60 and 62 weeks (n = 2).
