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A. Dormancy periods of mCherry-labeled U-87 MG (red, n = 6) and Clone #1 (black, n = 7) orthotopic tumors (total signal (counts/s) as measured by CRI Maestro™ imaging system). B. Twenty-four days post intracranial inoculation, U-87 MG tumors are significantly larger as detected by increased fluorescent signal (∼750 counts/s) compared with Clone #1 tumors (∼300 counts/s) (p = 0.006).
