Fig. 4

In vivo biocompatibility studies. (a) Cox regression curve of mice injected with Gd₂O₃@BSA NPs. (b) Weight of mice injected with Gd₂O₃@BSA NPs. (c) Histopathological findings of key organs of mice treated with Gd₂O₃@BSA NPs (scale bar: 50 μm)