RRM2 and acute kidney injury: We further conducted the intersection analysis using Venn, and 14 common DEGs (RRM2, OLFM4, LTF, EGF, PTX3, NNMT, SLC23A1, LCN2, FAM151A, RALYL, TMEM252, RARRES1, COL6A3, CUBN) were ultimately determined from COVID-19 and AKI datasets (Fig. 2E).