This family consists of several Vibrio cholerae toxin co-regulated pilus biosynthesis protein F (TcpF) sequences. TcpF is known to be a secreted virulence protein but its exact function is unknown [1].

1: Characterization of VPI pathogenicity island and CTXphi prophage in environmental strains of Vibrio cholerae. Mukhopadhyay AK, Chakraborty S, Takeda Y, Nair GB, Berg DE; J Bacteriol 2001;183:4737-4746. PMID:11466276