Figure 1 Schematic structure of particles of the three genera of the order Nidovirales. MEM, lipid membrane; CS, core shell; N, nucleocapsid; S, spike protein; M, membrane protein; E, envelope protein; HE, hemagglutinin-esterase; GL, large glycoprotein; GS, small glycoprotein.
Figure 2 Schematic representation of genome structure and expression of members of the order Nidovirales. A. Genome structure. ORFs are represented by boxes. Untranslated sequences are indicated by solid lines. The pseudoknots in ORF1 are aligned. The proteins encoded by the ORFs are indicated. The 5 leader sequences are depicted by a small black box. Poly(A) tails are indicated by An. S, spike protein; M, membrane protein; E, envelope protein; N, nucleocapsid protein, L, leader; HE, hemagglutinin-esterase protein; GL and GS large and small surface glycoproteins, respectively; I, internal ORF. B. mRNA synthesis. Poly(A), is indicated by An. The acronyms are as in A with the thick lines indicating protein coding sequences.
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