Cross section of white and red skeletal muscle fibers. This cross section of muscle fibers stained with the NADH-TR reaction demonstrates two fiber types. The deeply stained, smaller muscle fibers exhibit strong oxidative enzyme activity and correspond to the red muscle fibers. The lighter-staining, larger fibers correspond to the white fibers. x280. Inset. Portions of the two fiber types at higher magnification. The reaction also reveals the mitochondria that contain the oxidative enzymes. The contractile components, the myofibrils, are unstained. X550. (Original slide specimen courtesy of Dr. Scott W. Ballinger.)
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