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MTT assay on the inhibition rate of SMMC-7721 cells after treatment with quercetin together with Ni nanoparticles, which indicates significant inhibition effect of quercetin in the presence of Ni nanoparticles on SMMC-7721 cells in comparison with either quercetin or Ni nanoparticles, where * representsp < 0.05.Error barsindicate standard deviation
