Figure 1.

The genomic structure and phylogenetic tree of coronaviruses. A, The phylogenetic tree of representative CoVs, with the new coronavirus 2019‐nCoV highlighted in red. B, The genome structure of four genera of coronaviruses. Pp1a and pp1b represent the two long polypeptides that are processed into 16 nonstructural proteins. S, E, M, and N indicate the four structural proteins spike, envelope, membrane, and nucleocapsid. 2019‐nCoV, 2019 novel coronavirus; CoVs, coronavirus; HE, hemagglutinin‐esterase. Viral names: HKU, coronaviruses identified by Hong Kong University; HCoV, human coronavirus; IBV, infectious bronchitis virus; MHV, murine hepatitis virus; TGEV, transmissible gastroenteritis virus