Martens et al. showed increased levels of the kinin peptide bradykinin-(1–5) (89.6 pM vs. 0.0 pM in the control group), MPO-DNA complexes (699.0 ng/mL vs. 70.5 ng/mL in the control group), and increased tissue kallikrein activity (18.2 pM vs. 3.8 pM in the control group) in the bronchoalveolar lavage fluid of patients with severe COVID-19 [86]. The gene discussed is MPO; the disease is COVID-19.