Homologous HpyAV R-M systems.

aNames as in REBASE. All REases, except HpyAV and Hin4II, are putative (names end with P).bIn the genomic sequence, HpyGORF49P contains a deletion that introduces a stop codon within the HNH catalytic site. The reported length is a theoretical number based on the re-introduction of the deleted nucleotide to the genomic sequence.cSequence identity for M1 and M2.Hin4II were calculated based on pair-wise alignment of segments of M.HpyAV that can be aligned to M1 and M2.Hin4II, respectively (Fig. 1).