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This article demonstrates that mannotriose effectively induces the differentiation of mesenchymal stem cells into neuron-like cells in vitro. Rat-derived mesenchymal stem cells were investigated on their potential to differentiate into neuron-like cells induced by mannotriose purified from Radix Rehmanniae Preparata in vitro. The percentage of the neuron-specific enolase positive cells and the Nissl positive cells after mannotriose treatment was increased. The mRNA levels of neurofilament medium and neuron-specific enolase were upregulated in the mannotriose group compared to the control. These findings demonstrate that mannotriose purified from Radix Rehmanniae Preparata can effectively induce differentiation of rat-derived mesenchymal stem cells into neuron-like cells.