One of the reasons terminases are interesting is that they are somehow “essential” in tailed phages. Essential is a word that should always be used with caution because such thing does not exist in phage genomes (unlike ribosomal genes and tRNA synthetases in bacteria for example).

So, here is a nice cluster around terminases… (Please click the Read more button (below)  to see it. I had to put it in another page to avoid clogging the main page)

A cluster of phage terminase and portal protein-encoding genes