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Comparison of radioactivity 24 and 48 h after stem cells were injected according to the gamma counter. (a) Significant increases in radioactivity were seen in the brain, kidneys, and liver of the AD model, whereas that in the in lungs and spleen decreased with time. (b) Radioactivity in the brain and spleen increased significantly with time in the control group, whereas that in the kidneys and liver decreased significantly. Liver radioactivity did not change significantly with time.
