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Phylogenetic analysis of β-fructofuranosidases. Amino acid sequences of β-fructofuranosidases were aligned by the ClustalX program, and the phylogenetic tree was constructed by the neighbor-joining method using the MEGA3 program package (20). Bootstrap values after 1,000 replications are shown. GenBank™ or SwissProt accession numbers of sequences are shown in parentheses.
