Figure 4: OA increased the number of TUNEL positive cells. (A) Fragmented DNA was displayed as yellow grains, which indicate apoptotic cells. After 56 operative days, the amount of TUNEL positive cells markedly increased in the control group of scar tissue (b) in comparison with the normal group (a). Nevertheless the treatment with OA for 28 days further increased the number of TUNEL positive cells ((d)–(f)) when compared with the control group. (B) The number of TUNEL positive cells was revealed in the different groups. compared with the normal group; compared with the control group. Data are expressed as the mean ± SD. .