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Phylogenetic trees. Trees were made by the maximum likelihood method in the Tree-Puzzle 5.0 program (1,000 puzzling steps) using the 5′ half (640 nt: 8291–8930) or 3′ half (539 nt: 8931–9469) of the E1 gene sequence. Bootstrapping values (out of 100) for each node are given.
