Domains and motifs in phage T4 terminase proteins. Schematic representation of domains and motifs in the small terminase protein gp16. A) and the large terminase protein gp17 (B). The functionally critical amino acids are shown in bold. Numbers represent the number of amino acids in the respective coding sequence. For further detailed explanations of the functional motifs, refer to  and .
Rao and Black Virology Journal 2010 7:356 doi:10.1186/1743-422X-7-356