Members of this family, which are predominantly found in prokaryotic 4-alpha-glucanotransferase, adopt a structure composed of six antiparallel beta-strands, four of which form a beta-sheet and another two form a type I' beta-hairpin. The role of this family of domains, has not, as yet, been defined.
Jiyao W et al.(2023). "The conserved domain database in 2023.",