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genotypes, which is probably more genetically related.Prokaryotic viruses with DNA genome longer than 200 kb are collectively referred to as "jumbo phages". Some representatives of this phylogenetically diverse group encode two DNA-dependent RNA polymerases (RNAPs)-a virion RNAP and a non-virion RNAP. In contrast to most other phage-encoded RNAPs, the jumbo phage RNAPs are multisubunit enzymes related to RNAPs of cellular organisms. Unlike all previously characterized multisubunit enzymes, jumbo phage RNAPs lack the universally conserved