Urinary 12‐HETE is located close to host response cluster 1 (Figures 7A and D) and so are several immune response related proteins, many of which differ significantly in their abundance in moderate versus severe COVID‐19 (such features are represented by larger circles in the figure), including IL‐12B, CLEC4C, FLT3L, TRAIL and TNFB. This evidence concerns the gene FLT3LG and COVID-19.