A-F. Representative photographs of immunofluorescent staining for α-SMA (red) and human β2M (green) on cultured human AT-MSCs (A), murine primary dermal fibroblasts (mFB) (B), mFB treated with 2 ng/ml recombinant human TGF-β1 (C), and co-cultures of mFB with AT-MSCs (D) or TGF-β1 siRNA transfected AT-MSCs (E) or control siRNA transfected AT-MSCs (F) after 48 h culture. Nuclei were counterstained with DAPI (blue). G. Quantification of α-SMA immunofluorescence shown in (A-F) 