Fig. 3From: The preconditioning of lithium promotes mesenchymal stem cell-based therapy for the degenerated intervertebral disc via upregulating cellular ROSPreconditioning of LiCl promotes the NP cell phenotype differentiation efficacy. a Relative mRNA expression of NP cell markers after preconditioning. b Protein level of NP cell markers after preconditioning. Error bars depict Mean ± SD. (*P < 0.05)Back to article page