Figure 1

Electropherogram (PAGE) of selected passages in MA104 cells of three porcine RVA strains. The RNA genomic segments of three vaccine strains from different passage numbers were separated by PAGE and visualized using silver staining. The original virulent strains and each passage of 174-1 (A), K71 (B), and PRG942 (C) demonstrated typical RVA’s RNA segment patterns of 4-2-3-2 and maintained their own patterns throughout the serial passages. Lane 1, original virulent strain; lane 2, 10^th passage; lane 3, 20^th passage; lane 4, 40^th passage; lane 5, 60^th passage; lane 6, 80^th passage.