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BLI signal of 4 weeks after transplantation of BMSC in different groups of injection time in MCAO mice. The mean signal intensity of 2-h, 1-day, 3-day, and 1-week group was 2.6×107 ± 7.4×106, 6.1×106 ± 1.2×105, 1.6×105 ± 4.4×104, and 8.9×106 ± 9.5×105, respectively. The 2-h group shows the highest signal intensity comparing to other experimental groups (p < 0.01). The signal of the 1-week group is higher than that of 1-day group without statistically significant.
