For the COVID-19 severity prediction some of these are direct bilirubin (BILD), the diabetes indicator glycated hemoglobin (HBA1CM), interleukin 6 (IL-6), and the enzyme lactate dehydrogenase (LDH), which indeed have a high value of \documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$$U_f$$\end{document}Uf (panel b) but do not enter in the best model (panel a). The gene discussed is IL6; the disease is diabetes mellitus.