Quantification of acetylcholinesterase (AChE) activity of purified exosomes. (A) AChE activity of exosomes from Ctrl, SJP, TMP and BOR treated C-MSCs (*P<0.05 vs Ctrl, TMP & BOR, n=6; #P<0.05 vs Ctrl, SJP, BOR, n=6); (B) Dose effect of SJP on the AChE activity of exosomes (*P<0.05, n=3); (C) Time effect of SJP on AChE activity of C-MSC-derived exosomes (*P<0.05, n=3).