Fig. 2
![Fig. 2](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12951-022-01492-9/MediaObjects/12951_2022_1492_Fig2_HTML.png)
Biosafety of the MH-PLGA-IR780 NPs. A Relative viability (%) of HOS cells after coincubation with a wide range of NPs concentrations. B Relative viability (%) of HOS cells after coincubation with MH-PLGA-IR780 NPs (PLGA: 0.2 mg/mL) at prolonged time points. (The data are presented as the mean ± SD). C, D Blood indexes (routine blood and biochemistry) and H&E staining of the main organs (heart, liver, spleen, lung and kidney) of BALB/c nude mice were collected at 0, 1, 7, 14, and 28 days after post injection of MH-PLGA-IR780 NPs (n = 5). The scale bars represent 100 µm