Fig. 4
Cell viability. a Cell viability of L929 cells after treated with MnCO3 and PEI-MnCO3 NCs. b Cell viability of 4T1 cells after treated with MnCO3 and PEI-MnCO3 NCs. c Cell killing effect of different treatment on 4T1 cells in dark or under LED light. Data are represented as mean ± standard deviation (SD); n = 4; Statistical significance was analyzed by the two-tailed Student’s t-test. *p < 0.05, **p < 0.01. All light treated groups were compared to the dark treated group. d Live/dead staining of 4T1 cells with different treatment, scale bar = 50 μm