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Human insulin-like growth factor 1-transfected umbilical cord blood neural stem cells were transplanted into a hypoxic-ischemic neonatal rat model via the tail vein.BrdU-positive cells at day 7post-transplantation,as well as nestin-and neuron specific enolase-positive cells at day 14 wereincreased compared with those of the single neural stem cell transplantation group.In addition,theproportion of neuronal differentiation was enhanced.The genetically modified cell-transplanted ratsexhibited enhanced performance in correctly crossing a Y-maze and climbing an angled slope compared with those of the single neural stem cell transplantation group.These results showed that human insulin-like growth factor 1-transfected neural stem cell transplantation promotes therecovery of the leing,memory and motor functions in hypoxic-ischemic rats.