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Although interventions such as hormone therapy and exercise may seem only distantly related to molecular research on myostatin , the links between these avenues of research are the mechanisms that underlie muscle wasting . It leads to progressive loss of those nerve cells that control muscle bulk and movement . For instance , the symptoms of MG include muscle fatigability , as acetylcholine is not present to stimulate the muscle for long periods of time . Signs associated with hypocalcemia include muscle fasciculations , synchronous diaphragmatic flutter , stiff gait , and abnormal behavior such as aggressiveness , head pressing , swaying , or disorientation . If your doctor tells you to increase the amount of medicine you are taking or if you are just starting this medicine , make sure you tell the doctor right away if you get muscle pain , tenderness , or weakness . RMS cells tend to have variable differentiation along the myogenesis pathway and may appear as strap cells or myotubes that sometimes contain muscle cross-striations .