For instance, Lai et al. analyzed mRNA expression profiles of COVID-19 from the GEO database, identified SARS-CoV-2 infection-related mRNA coexpression modules through WGCNA, and screened three hub mRNAs (CLEC4D, DUSP13, and UNC5A) correlated with immune activities through mechanism learning [31]. Here, CLEC4D is linked to COVID-19.