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Objective: To study the mechanism of overexpression of mitochondrial ferritin(MtFt) for inhibiting euroblastoma cells proliferation.Method: electedtFt-SY5Y cells as experimental model and used pcDNA3.1-SY5Y as control group,using folw cytometer,western blot to observe the effect of overexpression of MtFt onSH-SY5Y cells proliferation,iron metabolism related protein (TfR and ferritin),cyclins(CyclinD1,CyclinE ) and cyclin dependant kinases(Cdk2,Cdk4).