This family consists of P13 proteins from Borrelia species. P13 is a 13kDa integral membrane protein which is post-translationally processed at both ends and modified by an unknown mechanism [1].

1: P13, an integral membrane protein of Borrelia burgdorferi, is C-terminally processed and contains surface-exposed domains. Noppa L, Ostberg Y, Lavrinovicha M, Bergstrom S; Infect Immun 2001;69:3323-3334. PMID:11292755