This short repeat contains the motif WXXGXW where X can be any amino acid. It is generally found in 2-5 copies in short secreted bacterial proteins. Its precise function is as yet unknown, but evidence suggests that members of this family are important for the function of specific sub-types of two-partner secretion systems [1].

1: The Burkholderia bcpAIOB genes define unique classes of two-partner secretion and contact dependent growth inhibition systems. Anderson MS, Garcia EC, Cotter PA; PLoS Genet. 2012;8:e1002877. PMID:22912595