This domain family is found in eukaryotes, and is approximately 110 amino acids in length. This family contains a transcription factor which regulates the expression of the costimulatory molecules on lymphocytes.

1: The human AKNA gene expresses multiple transcripts and protein isoforms as a result of alternative promoter usage, splicing, and polyadenylation. Sims-Mourtada JC, Bruce S, McKeller MR, Rangel R, Guzman-Rojas L, Cain K, Lopez C, Zimonjic DB, Popescu NC, Gordon J, Wilkinson MF, Martinez-Valdez H; DNA Cell Biol. 2005;24:325-338. PMID:15869410