Fig. 9From: Induction of cervical disc degeneration and discogenic pain by low concentration Propionibacterium acnes infection: an in vivo animal studyA The difference remained statistically significant compared to the control group. B, C The cervical intervertebral discs in the modeled segments exhibited additional degeneration at eight weeks postoperatively. D The staining revealed the distribution of the nerve fiber marker protein gene product 9.5 (PGP 9.5)Back to article page