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The percentage of positive NP cells in the intervertebral disc tissue of the degenerative disc disease (“p”—patients) and control group (“h”—healthy) discs. * p < 0.05. *** p < 0.001. **** p < 0.0001. NP = nucleus pulposus, IL = interleukin, and VEGF-A = vascular endothelial growth factor A.
