Chondrogenic differentiation of SFCs and SFMSCs after culture in induction medium for 21 days.

<p>(A) Cartilage nodule formed by SFCs after the induction period. <b>(B)</b> Safranin O staining and <b>(C)</b> collagen type II immunohistochemical staining of cartilage nodules formed by SFCs. <b>(D)</b> Cartilage nodule formed by SFMSCs after the induction period. <b>(E)</b> Safranin O staining and <b>(F)</b> collagen type II immunohistochemical staining of cartilage nodules formed by SFMSCs. Scale bars = 1 mm in <b>(A, D)</b> and 100 µm in <b>(B, C, E, F)</b>.