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Expression of interleukin-17 in intervertebral disc nucleus pulposus tissue samples as observed by immunohistochemical staining of (A) lumbar intervertebral disc nucleus pulposus tissue in a control tissue sample and (B) cartilage cells in the posterior outer ring of the disrupted and non-disrupted lumbar intervertebral disc in an experimental tissue sample. Arrow = positive expression of interleukin-17.
