This model describes a conserved core region of about 43 residues [1] which occurs in more than 400 mostly secreted or cell surface-located proteins from over 300 eubacterial and few archaeal species. These proteins contain between one and 34 copies of the domain that often occur in tandem arrays with up to more than 20 copies [2].

1: Fold and function of the InlB B-repeat. Ebbes M, Bleymuller WM, Cernescu M, Nolker R, Brutschy B, Niemann HH; J Biol Chem. 2011;286:15496-15506. PMID:21345802

2: MET-activating Residues in the B-repeat of the Listeria monocytogenes Invasion Protein InlB. Bleymuller WM, Lammermann N, Ebbes M, Maynard D, Geerds C, Niemann HH; J Biol Chem. 2016;291:25567-25577. PMID:27789707