Acetylcholine receptor antibodies were studied in the serum of 21 myasthenic patients. In 18 cases antibodies directed against sites other than the toxin binding were present whereas in 10 cases only there was a measurable inhibition of the ligand binding site. These 10 sera were from the 6 patients in stage IIB, III and IV and from 4 of the 12 patients in stage IIA. Antibodies against both non-toxin and ligand binding sites were measured in IgG subclasses. Most of the antibodies of the first type belonged to either subclass 1 or 3. They were, however, never absent from subclasses 2 and 4. Antibodies of the second type were not found in subclasses 2 and 4 except in one case. In 3 cases they were present exclusively in subclass 3. In 3 patients there was no correlation between the subclass distribution of the antibodies for the different binding sites.
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