Figure 4.

Neighbor-joining phylogenetic tree of the large terminase gene products from the Phamerator database indicate proposed packaging strategies. Colored boxes indicate proteins belonging to the same pham. Proteins that are not highlighted are orphams. Large terminase proteins grouped into similar phams are closely related on the tree and share a packaging strategy. *Experimentally determined headful packaging, circularly permuted terminal repeats [26, 27], **Experimentally determined 3′ cohesive ends [28]. ***Experimentally determined, long direct terminal repeats [29].