“…In this article, we show, in the specific case of SARS-CoV-2, that the role of cytosine-based metabolites used as cell growth coordinators is central to understanding both innate antiviral immunity and the evolution of the virus. An outbreak of atypical pneumonia, first noticed in Wuhan, Hubei province, China (Huang et al, 2020), developed into the COVID-19 pandemic (Jee, 2020) that displayed alarming similarities to symptoms caused by other β-coronaviruses (β-CoVs), SARS (Turinici and Danchin, 2007) and MERS (Bermingham et al, 2012) in particular. To contain the epidemic, efforts have been placed on diagnostic (Udugama et al, 2020), epidemiology (Park et al, 2020), vaccines (Zhang et al, 2020) and exploration of the use of old drugs to act as anticoronaviral drugs (Du and Chen, 2020).…”