This domain was called the KilAC domain by Iyer and colleagues [2].

1: The tripartite immunity system of phages P1 and P7. Heinrich J, Velleman M, Schuster H; FEMS Microbiol Rev 1995;17:121-126. PMID:7669337

2: Extensive domain shuffling in transcription regulators of DNA viruses and implications for the origin of fungal APSES transcription factors. Iyer LM, Koonin EV, Aravind L; Genome Biol 2002;3:RESEARCH0012. PMID:11897024