RNA migration patterns of some Nigerian human group A rotaviruses and laboratory reference strains belonging to group A. Lanes: 1, S2 (G2P1B, human); 2, KU (G1P1A, human); 3, 69M (G8P4, human); 4, A5-10 (G8P[1], bovine); 5, HMG035 (G8P[1], human). The numbers on the right refer to the corresponding gene segment number. The migration is from top to bottom.