hNSCs transplant into Nude Mice CNS. The lateral striatum of nude mice was the target area (A, arrow) for the transplantation of normal hNSCs (B) or glioblastoma cancer stem cells (GBM; positive graft controls; C). Mice were sacrificed six (B) and two months (C) after transplantation, respectively. The hematoxilyn/eosyn stain showed that structural organization of the transplanted regions was well preserved in mice tranplanted with hNSCs (B), whereas hypercellularity and anomalous growth and necrosis ensued in regions receiving GBM cells (C). Confocal microscopy of anti-human nuclei staining (huN, green, D) showed that hNSCs engrafted efficiently, with only a few human cells retaining residual proliferation activity as shown by co-labeling with the proliferation marker ki67 (red). hNSCs labeled with huN (E, green) differentiate into βTubIII+ neurons (E, red) and GFAP+ astrocytes (F, red). Nuclei are shown by DAPI staining. Scale bars: D-E = 15 μm; all insets: 10 μm, bar in inset D.