Research Article

Promoting Effects on Proliferation and Chondrogenic Differentiation of Bone Marrow-Derived Mesenchymal Stem Cells by Four “Kidney-Tonifying” Traditional Chinese Herbs

Figure 2

Immunofluorescence staining of Collagen type II protein. (a) Collagen type II protein was strongly detected in the presence of TGF-β1 induction (×200); (b) Collagen type II protein was not detectable in the negative control group (×200).
(a)
(b)