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Amino acid alignment of dUTPases from chlorella viruses PBCV-1, IL-3A, and SH-6A. Alignments were done with the Wisconsin GCG PILEUP program. The five most conserved motifs in dUTPase are labeled. (Note that virus IL-3A dUTPase differs by two amino acid residues in motif III from the other two dUTPases.)
