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Sequence alignment of NM23-X4. (A) Phylogenetic tree of human and Xenopus NM23 members. The tree was constructed using the Clustal W method with the parameter PAM250. (B) Nucleotide sequence alignment of NM23-X4 with NM23-H4, -X1, -X2, and -X3. Asterisks indicate identical amino acids among all NM23 family members. The previously reported important amino acid residues are shown as shaded boxes.
