Members of this family are large and almost certainly multifunctional proteins found in various pathogens from genus Chlamydia, about 3000 amino acids in size and related to lymphostatin (Efa1/LifA) from enteropathogenic Escherichia coli. Roles have been suggested for Efa1 (EHEC factor for adherence) in adhesion, so some members have been annotated as adherence proteins rather than cytotoxins.
Jiyao W et al.(2023). "The conserved domain database in 2023.",