Fig. 5. Skeletal muscle from Myog^flox/flox and Myog^flox/flox mice at 10 weeks of age. (A-D) Cross-sections (A,B) and longitudinal sections (C,D) of hindlimbs. (E,F) Sections through tongues. (G-J) Sections through diaphragms. One Myog^flox/flox mouse has a thin diaphragm (H). Thin diaphragms were found in only a single pair of mice from a single litter. All other Myog^flox/flox mice had normal diaphragms (J). Scale bar: 100 µm. (K) Identical myofiber diameters were observed in Myog^flox/flox and Myog^flox/flox mice. Myofiber diameters were determined from cross-sections of hindlimbs of mice at 10 weeks of age. Each column represents the diameters determined for individual myofibers from a single hindlimb section (squares). The genotypes are shown below the graph.