Increase in proteoglycan concentration for 3D co cultured adipose-derived mesenchymal stem cells (AD-MSC) and annulus cells compared with separate culture of AD-MSC and annulus cells alone. Data from eight 1,9-dimethylmethylene blue analyses were examined using repeated measure analysis of variance. p < 0.05.
Tapp et al. Arthritis Research & Therapy 2008 10:R89 doi:10.1186/ar2473