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Phylogeny of Populus inferred from the combined 23 single-copy nuclear DNA sequence using ML method. (A) Numbers near the nodes sequentially indicated ML/MP/BI support values. (B) Indicates the topology difference derived from MP analysis. P, Populus; A, Aigeiros; L, Leucoides; Aba, Abaso; Tac, Tacamahaca; Tur, Turanga.
