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Structures and nomenclature of helicase II (UvrD) C-terminal deletion mutants. Approximate positions of six conserved helicase motifs are shown for UvrD (motif Ia is not shown). The sequence of motif VI, as described by Gorbalenya et al. (10) is in boldface. The arrow points to a trypsin cleavage site previously described by Chao and Lohman (5). An asterisk denotes the end of each polypeptide. Amino acid residue numbers are indicated above the sequence for wild-type UvrD.
