Figure 3: (a) Representative microscopic photos of immunofluorescence staining showing COL-1 immunoreaction (IR) positive products. Nucleus counter stained with DAPI showed blue and red for COL-1 positive products. (b) Average optical density (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.