Therefore, in the course of SARS-CoV-2 infection, the presence of furin may result in some clinical symptoms (Dittmann et al., 2015), for example, the furin-mediated entrance of SARS-CoV-2 into the cardiomyocyte may clarify the cardiac injury in patients with COVID-19 (Dittmann et al., 2015). Here, FURIN is linked to COVID-19.