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MR imaging of HA-SPIO and TRAILhMSCs on U87MG xenograft model. (A) T2-weighted images and (B) T2 relaxivity of HA-SPIO in aqueous solution was examined by 7T MRI. (C) In vivo MR images were acquired 24 hours after intracranial injection of hMSCs or TRAILhMSCs. The signal intensity in the region of interest (R.O.I.) was measured using ImageJ.
