This family contains a number of RstB proteins approximately 120 residues long, including RstB1 and RstB2, from the Vibrio cholerae phage CTX. Functional analyses indicate that rstB2 is required for integration of the CTXphi phage into the V. cholerae chromosome [1].

1: Regulation, replication, and integration functions of the Vibrio cholerae CTXphi are encoded by region RS2. Waldor MK, Rubin EJ, Pearson GD, Kimsey H, Mekalanos JJ; Mol Microbiol 1997;24:917-926. PMID:9220000