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BBB score. At 1, 2, and 4 weeks after surgery, the BBB score between PMSCs (A) and BMSCs (B) and GDNF-transfected-PMSCs (C) and GDNF-transfected-BMSCs (D) were significantly different (P<0.05); the difference between GDNF-transfected-PMSCs (C) and GDNF-transfected-BMSCs (D) was not significant (P>0.05).
