SOX2 and Stroke: We further characterized the in vivo profile of surviving drNPCs (HuNu+ or STEM121+ cells) at 32 days post-stroke using immunostaining for Sox2 and Nestin (undifferentiated NPCs), GFAP (astrocytes), TUJ1 (immature neurons), NeuN (mature neurons), and Olig2 (oligodendrocytes).