Members of this family are found in a subset of bacterial flagellar operons, generally between genes designated flgD and flgE, in species as diverse as Bacillus halodurans and various other Firmicutes, Geobacter sulfurreducens, and Bdellovibrio bacteriovorus. The specific molecular function is unknown. [Cellular processes, Chemotaxis and motility]
Jiyao W et al.(2023). "The conserved domain database in 2023.",