Fig. 5
Representative MRI images of the brains at 3 days, 9 days, 15 days and 21 days followed by transplantation with USPIO-PAA/PEG labeling HADSCs or saline. The MRI images of the corresponding controls, i.e. normal rats or PD rat model injected with saline, were shown in the 1st and 2nd rows, respectively. Note that compared to the negative signals in the control, the rat brains transplanted with USPIO-PAA/PEG-labeled HADSCs showed a constant and clear MRI signals up to 21 days. The bar represents 5 mm