A) Three months of IVIG preserved plasma levels of select mRNAs regulating cytoskeletal function. Heat map (red to green = increasing mRNA levels) shows that, compared to placebo, IVIG treatment resulted in 40–50% higher expression levels of transcripts encoding microtubule-associated protein 1b (MAP1b), neurofilament heavy chain subunit (NEFH), A kinase anchor protein (AKAP), nestin (NES), Homer1 (HOMER1), and activity-regulated cytoskeletal-associated protein (ARC). Levels of these transcripts were not significantly different between the baseline and IVIG group. B) Six months of IVIG resulted in ~50% higher levels of NEFH, AKAP, NES, and ARC compared to placebo. Levels of these transcripts were not significantly different between the baseline and IVIG group. n = 12/group *, p< 0.01, **, p< 0.001 via one-way ANOVA with Bonferroni’s post hoc test for multiple comparisons. Other abbreviations: ACTB (β-actin), TUBB2C (β-tubulin), MAP2 (microtubule-associated protein 2), NFEL and NFEM (neurofilament light and medium chain subunits), UTRN (utrophin).