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Immunohistochemical staining of the intervertebral disc for TGF. A : The chondrocytes of the intervertebral disc in primary group were stained intensely by TGF (Immun-Peroxidase, original magnification 100). B : In contrast, the chondrocytes of the intervertebral disc in the recurrent group were stained moderate by TGF (Immuno-Peroxidase, original magnification 100). TGF : transforming growth factor.
