This family includes the following members: FlhB, HrpN, YscU, SpaS, HrcU SsaU and YopU. All of these proteins export peptides using the type III secretion system. The peptides exported are quite diverse.

1: Type III protein secretion systems in bacterial pathogens of animals and plants. Hueck CJ; Microbiol Mol Biol Rev 1998;62:379-433. PMID:9618447

2: Erwinia amylovora secretes harpin via a type III pathway and contains a homolog of yopN of Yersinia spp. Bogdanove AJ, Wei ZM, Zhao L, Beer SV; J Bacteriol 1996;178:1720-1730. PMID:8626302