Figure 1.

Effect of heterozygous loss of Fst on muscle mass. Bottom panel shows percent decrease in muscle weights in Fst^+/− mice compared with wild-type mice. Middle panel shows percent decrease in muscle weights in Fst^+/−, Mstn^+/− mice compared with Fst^+/+, Mstn^+/− mice. Top panel shows percent decrease in muscle weights in Fst^+/−, Mstn^−/− mice compared with Fst^+/+, Mstn^−/− mice. All calculations were made from the data shown in Table 1. Muscles analyzed were: pectoralis (red), triceps (gray), quadriceps (blue), and gastrocnemius (green).