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Alignment of λ Exo and SPP1 Chu. Motifs shared with the Redα superfamily are boxed (3, 30). Identical and similar amino acids have dark and light shading, respectively. The first aspartate (D) in motif III and the glutamate (E) and lysine (K) in motif IV are found in type II restriction endonucleases and in E. coli RecB (3, 13, 21).
