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Muscle mass and fiber cross-sectional area in quadriceps of Stat5MKO and control mice. A) Quadriceps from 3-mo-old male Stat5MKO mice were reduced ∼35% in weight compared to controls (n=12), while quadriceps from females were reduced only 8% (n=12) B) Body weight of male Stat5MKO mice in panel A was reduced ∼15%, while body weight of females was reduced by 10%. C) Cross-sectional area of individual gastrocnemius and quadriceps muscle fibers (average of 100 fibers).
