Changes in postnatal meniscus development in mice with Col2Cre-mediated conditional FoxO deletion. (A) Safranin-O staining of control, Col2Cre-FoxO TKO, FoxO1, 3, and 4 single KO mice at P7 and 1 and 2 mo old; (B) Cell size (μm2); (C) cell numbers per meniscus area; (D) meniscus histopathology scoring and grading (n = 6 per group, *P < 0.05).