All of these possess a putative holin that share a high level of identity.
Additionally, Gp9 of E. coli phage phiE49 is similar in sequence.
These proteins are short, 55 to 71 amino acyl residues (aas) in length, and exhibit a single transmembrane segment (TMS).
[1] A representative list of proteins belonging to the T1 Holin family can be found in the Transporter Classification Database.
[2] As of this edit, this article uses content from "The Phage T1 Holin (T1 Holin) Family", which is licensed in a way that permits reuse under the Creative Commons Attribution-ShareAlike 3.0 Unported License, but not under the GFDL.