Motor neuron syndrome and monoclonal IgM with antibody activity against gangliosides GM1 and GD1b

We demonstrated that an IgM M‐protein from a patient with motor neuron syndrome had antibody activity against gangliosides GM1, GD1b, and asialo GM1. Studies with a sugar‐binding lectin suggested that the epitope in the patient's M‐IgM involved the Gal(β1‐3) GalNAc moiety. Immunohistological te...

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