flagellar biosynthetic protein FliO
This short protein found in flagellar biosynthesis operons contains a highly hydrophobic N-terminal sequence followed generally by two basic amino acids. This region is reminiscent of but distinct from the twin-arginine translocation signal sequence. Some instances of this gene have been names "FliZ" but phylogenetic tree building supports a single FliO family.
Jiyao W et al.(2023). "The conserved domain database in 2023.",