CTH and Guillain-Barre syndrome: Overall, GBS sera show a more frequent and more pronounced complex-enhanced response to these sulfatide-containing complexes than do OND or healthy control sera (Kruskal-Wallis test for degree of complex enhancement, CTH:sul p=0.025, GA1:sul p=0.037, both p<0.001 when corrected for ties, Chi-squared comparison of frequency of complex enhancement, p<0.0001 for both antigens) (Figure 4C).