This family contains integral membrane proteins of unknown function. Most members of the family contain two copies of a region that contains an EXGD motif. Each of these regions contains three predicted transmembrane regions. It has been suggested that these proteins are calcium transporters [1].

1: Molecular evolution of a novel family of putative calcium transporters. Demaegd D, Colinet AS, Deschamps A, Morsomme P; PLoS One. 2014;9:e100851. PMID:24955841