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Amino-acid sequence alignment of DaFEN1 and other FEN1-family proteins [P. horikoshii FEN1 (PDB entry 1mc8), P. furiosus FEN1 (PDB entry 1b43), A. fulgidus FEN1 (PDB entry 1rxv) and human FEN1 (PDB entry 1ul1)]. The secondary-structure assignment of DaFEN1 is indicated by helices (α-helices and 310-helices) and arrows (β-strands). Highly conserved acidic residues in the active site are indicated by asterisks.
