This domain family is found in eukaryotes, and is approximately 30 amino acids in length. The family is found in association with Pfam:PF00046. This family is a homeobox protein involved in differentiation of embryonic cells to form the abdominal region.

1: A molecular study of abdominal-A in the ant Myrmica rubra reveals lineage dependent evolutionary rates for a developmental gene. Niculita H, Julien JF, Petrochilo E; Insect Mol Biol. 2001;10:513-521. PMID:11881816