| evidence for three groups of sequence variants of beet necrotic yellow vein virus rna 5. | about half of japanese isolates of beet necrotic yellow vein virus (bnyvv) were found to contain rna 5 molecules, which were also detected in virus isolates from china and france. sequence comparisons of rna 5 (nucleotides 327 to 1171) in 25 isolates showed that there are up to 8% sequence differences, and that rna 5 variants fall into three groups: group i contains most of the japanese and chinese isolates, group ii two japanese isolates, and group iii four french isolates. the group i isolates ... | 1999 | 10416372 |