This family represents a conserved region approximately 100 residues long within eukaryotic Ferroportin1 (FPN1), a protein that may play a role in iron export from the cell [1]. This family may represent a number of transmembrane regions in Ferroportin1.

1: Ferroportin1: a new iron export molecule? Le NT, Richardson DR; Int J Biochem Cell Biol 2002;34:103-108. PMID:11809412