Comparison of genome electropherotypes of CHRV field isolates. Lanes: 1, 93K332 strain (Chiba isolate); 2, 93K360 strain (Chiba isolate); 3, F522 strain (Fukui isolate); 4, 34803 strain (Tottori isolate); 5, T360 strain (Okayama isolate); 6, K9304 strain (Okayama isolate); 7, 93-48 strain (Saga isolate); 8, 93-42 strain (Saga isolate); 9, OK118 strain, which exhibits the pattern I electropherotype; 10, K9304 strain; 11, OK450 strain, which exhibits the pattern II electropherotype.