Immunohistochemistry (IHC) staining of chondrocyte differentiation marker genes in the femurs of 3-week old Runx1f/fCol2α1-cre and Runx1f/f mice, including anti-Runx1 (A), anti-Runx2 (B), anti-PCNA (C), anti-Col2α1 (D), anti-Col10α1 (E), and anti-MMP13 (F). (G) Quantification of positive staining cells and area in (A)-(F). All data are presented as mean ± SD, n=6, NS denotes not significant, **p<0.01, ***p<0.001.