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Since only one genus is currently recognized, the genus description corresponds to the family description.
See discussion under family description.
Species are demarcated based upon nucleotide sequence distances for the L, M and S segments being greater than 0.05 for comparisons between members of different species; nucleotide sequence distances are > 0.35 for comparisons between members of all species except for Pseudomonas virus phi6 and Pseudomonas virus phiNN, for which distances are > 0.15 (Figure 1.Cystovirus).
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