Characterization of anti-MOG antibodies using ELISA at day zero and 28. A) IgG anti-rhMOG, B) IgM anti-rhMOG, C) IgG anti-MOG peptide 35–55, D) IgM anti-MOG peptide 35–55. Mixed day 28 sera of WT or KO immunized mice were used as standard (arbitrarily defined as 100 U) for IgG or IgM antibodies, respectively. E) IgM binding to rhMOG coated at different concentrations. Sera from 8 mice were pooled for each of the following sample sets: Day 0 WT, Day 0 KO, Day 28 WT, and Day 28 KO. Pooled mice sera IgM Abs normalized at 0.1 mg/ml in the assay. Anti-mouse IgM was used as detection to exclusively measure the binding of IgM antibodies in serum.