GFAP and Ventriculomegaly: In fact in animals at 10 weeks of age we found that GFAP staining of NestinGFP+HMGB2-/- brain sections without ventriculomegaly revealed greater GFAP staining in the SVZ compared to age-matched WT mice, although the degree of this increase in GFAP staining in these HMGB2-/- mice without ventriculomegaly was not significant (data not shown).