In comparison to AKI group, in AKI + APO (Figure 6D), AKI + HBO (Figure 6E), and AKI + APO + HBO (Figure 6F) groups the intensity of HO-1 expression was diffuse, but with weak intensity in the cytoplasm of the proximal tubular epithelial cells with also restored expression on the apical surface of the proximal epithelial tubular cells, similar to the expression pattern previously noticed in SHAM group. Here, HMOX1 is linked to acute kidney injury.