Genome organization of the SPFMV group of potyviruses. P1; protein 1, HC-Pro; helper component proteinase, P3; protein 3, 6K1 (6K protein 1), CI;cylindrical inclusion protein, 6K2 (6K protein 2), VPg; viral protein genome-linked, NIa-Pro; nuclear inclusion protein a-proteinase, NIb; nuclear inclusion protein b, CP; coat protein, PIPO; Pretty Interesting Potyviridae ORF, and PISPO; Pretty Interesting Sweetpotato Potyvirus.