A, Representative immunohistochemical staining shows increased protein expression of MMP-13 along tibial articular cartilage of Fgf2ALLKO and Fgf2LMWKO (arrows) compared to WT littermates, while Fgf2HMWKO and WT have similar MMP-13 expression. B, Representative images show increased expression of ADAMTS-5 in the enlarged tendon and meniscus area of the medial tibia in both Fgf2ALLKO and Fgf2LMWKO (dashed arrows) compared to WT littermates, whereas Fgf2HMWKO and WT have similar ADAMTS-5 expression of the same area. Magnification=10X, n=3/group.