ITGAM and opsoclonus-myoclonus syndrome: Moreover, IgG isolated from sera upregulated CD11b expression from 0.91 ± 0.10 ng/mg total protein in the NB group and 0.88 ± 0.07 ng/mg total protein in the healthy control group to 2.95 ± 0.23 ng/mg total protein in the OMS + NB group (p < 0.001 vs NB, p < 0.001 vs healthy control, Fig. 1c).