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Chondrocytic gene expression of human NP cells. Analysis of the mRNA expression of collagen-II, aggrecan and Sox-9 suggested that exosome stimulation significantly induced chondrocytic gene expression at (A) day 7, (B) day 14 and (C) day 21. *P<0.05 vs. Ctrl. group. NP, nucleus pulposus; Ctrl., control; Expe., experimental.
