Sequence analysis of the cloned DNA. (A) Nucleotide sequence with predicted amino acid sequence of the provisional ORF product. Box, tentative ribosome-binding site; overlines, the SphI and SacII cleavage sites (see Fig. 2); underline, the seven N-terminal amino acid residues determined with the purified protein. (B) Comparison of the deduced amino acid sequence of the provisional ORF product with that of T4 endonuclease V (27). The pairs of identical amino acids are marked by asterisks. Upper row, the ORF product; lower row, endonuclease V.