Fig. 7From: Surgical removal and controlled trypsinization of the outer annulus fibrosus improves the bioactivity of the nucleus pulposus in a disc bioreactor cultureGene expression in nucleus pulposus (NP) cells of the cultured discs. CG: control group; EG: experimental group. Data are expressed as the mean ± SD (n = 3). *: p < 0.05 vs. the CGBack to article page