Has gene expression during skeletal muscle growth and remodeling. Mean normalized expression of relative mRNA levels of Has1, Has2, and Has3 in differentiating C2C12 myoblasts after the addition of differentiation medium (A), developing and adult limb muscles (B), notexin-injured tibialis anterior (C), and mdx and wild type Bl10 diaphragms (D). *, p < 0.05 for comparisons between genotypes in D (n = 8). Error bars, S.E.