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A 24-year-old female presents to her primary care physician with complaints of weakness and fatigue, worse in the afternoons for the last several months. The fatigue is relieved with a short nap. She has prominent bilateral ptosis. Which of the following is the target of the autoantibodies in this disease?

A- Acetylcholinesterase
B- Muscle fiber acetylcholine-gated ion channels
C- Muscle fiber membrane
D- Nerve fiber calcium channels
E- Nerve fiber membrane
 
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