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β-galactosidase staining indicating cells that have expressed Cre activity from either the matrilin-1 or collagen II promoter in mouse knee joints: (A) New born Col2a1-Cre/R26R (B) New born Matn1-Cre/R26R (C) 1 wk Col2a1-Cre/R26R (D) 1 wk Matn1-Cre/R26R (E) 3 wk Col2a1-Cre/R26R (F) 3 wk Matn1-Cre/ R26R. F = Femur, AC = Articular Cartilage.
