We compared the percentages of thymic mononuclear cells (TMC) that bind monoclonal antibodies to T-cell subpopulations in patients with myasthenia gravis (MG) and non-MG patients undergoing cardiac surgery (CS). There were no significant differences in percentages of OKT3+, OKT4+, OKT6+, or OKT8+ cells or the OKT4:OKT8 ratio. There was an increase in the percentage of Ia+ (immune response gene-associated antigen) TMC in MG compared with CS but no significant differences in B cells or phagocytic cells. The Ia+ cells could be abnormal B cells, activated T cells, or thymic dendritic cells.
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Lisak et al. (1983) studied this question.
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