Figure 4.

Outer annulus cells positive for brain-derived neurotrophic factor localization by Thompson grade. Mean percentage of outer annulus cells positive for brain-derived neurotrophic factor (BDNF) localization is shown for specimens from Thompson grades I and II pooled (n = 5), for grade III (n = 6), and for grades IV and V pooled (n = 11). Data presented as the mean ± standard error of the mean.

Gruber et al. Arthritis Research & Therapy 2008 10:R82   doi:10.1186/ar2456
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