Figure 4: (a) Immunofluorescence staining showing COL-2 immunoreaction (IR) positive products. Nucleus counter stained with DAPI showed blue and red for COL-2 positive products. (b) AOD was measured and data are expressed as the mean ± SD (ANOVA); , compared with the control group; , compared with sham compressed group, , compared with the model group on 56 days and compared with 28 days in EA group.