FABP4 and COVID-19: (Lower panel) GSEA of the gene sets that characterize tissue-resident alveolar macrophages in severe COVID-19, namely AMØ1 (EGAS00001005634) (Wendisch et al., 2021), TRAM1+ (GSE155249) (Grant et al., 2021), and FABP4+ (GSE145926) (Liao et al., 2020) on the ranked comparison of the transcriptomes of CHIR-AMØ vs. DMSO-AMØ.