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Objective:Tissueengineeringisapromisingmethodtotreatspinalcordinjury(SCI),therepairmechanismaretheseedcellcouldsecreteneurotrophinsanddifferentiateintoneurons,sohowtochooseappropriateseedcellwhichcouldstablereleaseneurotrophinsandeasilydifferentiateintoneuronsbecomeaproblemneedtobediscuss.