Abstract
The presence of IgG has been observed by fluorescence microscopy in the erythrocytes of 5 patients with NEF antibody. IgG subclass distribution of the IgG bound was analyzed by fluorescence-activated cell sorter. NEF activity was also determined in the eluted antibodies from the erythrocyte membrane. Three of five patients had NEF antibody bound to the erythrocyte membrane. IgG subclass distribution of NEF antibody sera was also investigated by means of protein A-Sepharose and using monoclonal antibodies against human IgG subclasses. NEF activity was mediated by IgG3 alone in 3 patients and by a combination of IgG1 and IgG3 in 2 patients.
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