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Maximum likelihood amino-acid tree of the viral terminase large subunit (terL). Bootstrap values are indicated as black (90% to 100) or gray (75% to 89%) dots at the nodes (100 replicates). Cyanophage genomes are denoted by * and cyanobacterial host genomes by #. The clade containing S-EIV1 (S-EIV1-like) is in bold.
