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Lymphocyte populations in non-neoplastic thymuses from fifteen patients with myasthenia gravis (MG) were examined. As in normal subjects, the great majority of thymic lymphocytes of MG patients are T cells. When MG thymuses were compared to normal glands, lower percentages of lymphocytes able to form E rosettes resistant to incubation at 37 degrees C (stable E rosettes) were found in MG thymuses. A negligible B cell content was detected in eight normal and in eight MG thymuses with absent or rare lymph follicles; but there was a substantial B cell presence in the thymuses of seven MG cases with thymic hyperplasia containing many germinal centres. Normal and MG thymuses contain the same percentage of lymphocytes bearing receptors for the Fc portion of IgM (TM). Moreover, the IgM Fc receptor was found mostly on cells which did not form stable E rosettes and did not bear surface immunoglobulin. The possible significance of these findings is discussed.
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Clinical and experimental immunology,
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Virchows Archiv. B, Cell pathology including molecular pathology,
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Nihon Kyobu Shikkan Gakkai zasshi,
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Journal of neurology, neurosurgery, and psychiatry,
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Rinsho shinkeigaku = Clinical neurology,
