S100B and infection: At 3 days post-infection (dpi), most GFP-positive cells expressed the astrocyte-specific markers GFAP (93.9 ± 0.9%), S100β (77.2 ± 4.8%), and glutamine synthetase (62.0 ± 2.4%) but poorly expressed other markers, including Olig2 (9.1 ± 1.8%), NG2 (1.3 ± 0.8%), IbaI (1.3 ± 0.6%), neuroprogenitor marker Nestin (6.9 ± 0.8%), and the neuronal markers doublecortin (0.0 ± 0.0%), TUJ1 (2.0 ± 0.9%), and NeuN (0.8 ± 0.8%) (Fig. 2A, B).