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BrdU expression in (A) the SSF group and (B) the SF group 6 weeks following surgery. (A) BrdU expression was positive; (B) BrdU expression was negative. Cells with positive BrdU expression were stained brown (magnification, ×200). BrdU, bromodeoxyuridine; SF, silk fibroin; SSF, BrdU-labeled adipose mesenchymal stem cells-SF group.
