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Genome organization of poliovirus type 1. Genomic RNA and its gene organization are shown. VPg is a small protein attached to the 5′ end of the genome; poly(A) is 3′ terminal. Nucleotide numbers are shown over the genome RNA. P1 represents the protein region of viral capsid; P2 and P3 non-capsid protein. Gene products are indicated by wavy lines, and figures in parentheses are molecular mass of the corresponding viral gene products. IRES stands for internal ribosome entry site.
