11. Over time, the muscle proteins oxidates, which may cause a brown discoloration near the surface of the meat. 12. This can happen by an increase in the muscle proteins , or through enhanced storage of glycogen in muscles. 13. This accumulation of calcium may activate proteases and phospholipases which in turn break down and degenerate muscle protein . 14. Mutations of a heart muscle protein , ?-myosin heavy chain ( MYH6 ) are associated with atrial septal defects. 15. But during the next day and a half, the body makes glucose from amino acids stolen from muscle protein . 16. One study, published last month, found no differences in the synthesis of muscle protein in young men who took it. 17. Duchenne muscular dystrophy is a muscle-wasting disease caused by the mutation of the gene that produces a muscle protein called dystrophin. 18. When fasting continues for more than a few hours, falling insulin levels permit catabolism of muscle protein and triglycerides from adipose tissue. 19. The "'sliding filament theory "'explains the mechanism of muscle contraction based on muscle proteins that slide past each other to generate movement. 20. Very dark urine indicates the body is breaking down muscle protein , a condition that can lead to fatal kidney damage, Otten said.
