This model describes a rare protein repeat, found so far in two species of Verrucomicrobia (Chthoniobacter flavus and Verrucomicrobium spinosum) and in four different proteins of Gloeobacter violaceus PCC7421. In the Verrucomicrobial species, the repeat region is followed by a PEP-CTERM protein-sorting signal, suggesting an extracellular location.
Jiyao W et al.(2023). "The conserved domain database in 2023.",