CD40LG and Charcot-Marie-Tooth disease type 3: Comparison within disease groups (Fig. 1B–E) showed that the patients from the NMOSD group had a lower proportion of IgM and IgD than those from the two other disease groups (IgM: vs. MOGAD, p = 0.026; vs. DSN, p = 0.028; IgD: vs. MOGAD, p = 0.007; vs. DSN, p = 0.045).