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Density and distribution of the cell population in the intervertebral disc tissue samples. (A) Chondrocytes of the lumbar intervertebral disc nucleus pulposus in a control tissue sample and (B) cartilage cells in the posterior outer ring of the ruptured and non-ruptured lumbar intervertebral disc in an experimental tissue sample. Arrow = cartilage collapse. Hematoxylin and eosin staining.
