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The results show that monoclonal IgD reacts specifically with ricinus agglutinin (molecular weight 120,000) (RcAI). The reaction between IgD and RcAI was inhibited by galactose and lactose but not by glucose, indicating that the interaction is mediated by galactose containing carbohydrate units located in or near the sigma-hinge region. Affinity chromatography on RcAI-Sepharose 4B was successfully used to isolate monoclonal IgD from the IgD myeloma plasma.
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Marcheş et al. (1986) studied this question.
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