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1) The circulating anti-muscle-specific tyrosine kinase antibodies caused neither muscle-specific tyrosine kinase nor acetylcholine receptor deficiency at the endplates; 2) the reduced intercostals miniature endplate potential and current amplitudes were not accounted for by acetylcholine receptor deficiency; 3) the faint immunoglobulin G deposits at the endplates may or may not represent anti-muscle-specific tyrosine kinase antibodies; and 4) the anti-muscle-specific tyrosine kinase antibodies may not be the primary cause of myasthenic symptoms in this patient. |
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