This family consists of several phage CII regulatory proteins. CII plays a key role in the lysis-lysogeny decision in bacteriophage lambda and related phages [1].

1: The phage lambda CII transcriptional activator carries a C-terminal domain signaling for rapid proteolysis. Kobiler O, Koby S, Teff D, Court D, Oppenheim AB; Proc Natl Acad Sci U S A 2002;99:14964-14969. PMID:12397182