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The level of DA in the corpus striatum of PD mice. DA level was greatly decreased in the model group, whereas it was obviously increased after hUC-MSC and hUC-MSC-FGF-20 treatments (@ p < 0.01, the normal group versus the model group; ∗ p < 0.01, the model group versus MSC and MSC-FGF-20 group; # p < 0.05, MSC group versus MSC-FGF-20 group).
