Abstract
A reproducible radioimmunoassay procedure for the determination of anti-acetylcholine receptor antibodies in the sera of patients with myasthenia gravis is described and examined in detail. The assay combines features of a number of methods previously outlined and allows repeat determinations of antibody titre in a given myasthenic serum sample with coefficient of variation 6%. The mean +/- standard deviation for normal human serum anti-acetylcholine receptor antibodies was found by this procedure to be 0.024 +/- 0.033 nmol/l alpha-bungarotoxin binding sites whereas the range for myasthenic patients was 0-139.14 nmol/l with a mean value of 7.55 nmol/l alpha-bungarotoxin binding sites.
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