Fig. 4From: Surgical removal and controlled trypsinization of the outer annulus fibrosus improves the bioactivity of the nucleus pulposus in a disc bioreactor cultureAnalysis of lactate dehydrogenase (LDH) activity on days 2, 4, 6, 8, 10, 12 and 14. CG: control group; EG: experimental group. Data are expressed as the mean ± SD (n = 3). *: p < 0.05, vs. the CGBack to article page