Immunolocalization of aggrecan and human nuclei (HuNu) in placebo and adipose mesenchymal stem cell (ADSC) groups. (A,B) Immuno-colocalization of aggrecan and 4',6-diamidino-2-phenylindole (DAPI) in placebo (A) and ADSC-implanted (B) groups. Scale bar, 200 μm. (C,D) Immunolocalization of Ki67, HuNu and DAPI in placebo group (C) and ADSC-implanted (D) groups. Scale bar, 50 μm.