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Fig. 3. Unrooted phylogenetic tree depicting the evolutionary relationship of
vertebrate PepT1 transporters. The unrooted tree was constructed using the
neighbor-joining (NJ) method (Saitou and
Nei, 1987) based on the alignment of the complete amino acid
sequences of known vertebrate PepT1 transporters. Bootstrap values (1000
replicates) indicating the occurrence of nodes are reported above each branch
in the figure.