Unexpectedly, we have also observed that MAFB controls the expression of genes regulated (up or down) upon SARS-CoV-2 exposure in both M-MØ and GM-MØ — including the expression of CCL18 and CXCL13, biomarkers for IPF (80–84, 98, 99) — and genes with expression that now appears as a predictor for COVID-19 severity and outcome. The gene discussed is CXCL13; the disease is idiopathic pulmonary fibrosis.