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Alignment of H-N-H family endonucleases of phage T4. Sequence of MobA (old) is as reported in accession no. NC_000866. All other sequences are as reported in T4 genomic sequence accession no. HM_137666. The beginning of putative gene product 60.1, within the MobA reading frame, is indicated by an open triangle. The location of the tyrosine to amber nonsense mutation at codon 195 is indicated by an asterisk. Alignment and shading were performed as in Fig. 1.
