This family consists of proteins with similarity to the mitochondrial proteolipids. Mitochondrial proteolipid consists of about 60 amino acids residues and is about 6.8 kDa in size [1].

1: Isolation and amino acid sequence of a novel 6.8-kDa mitochondrial proteolipid from beef heart. Use of FAB-MS for molecular mass determination. Terzi E, Boyot P, Van Dorsselaer A, Luu B, Trifilieff E; FEBS Lett 1990;260:122-126. PMID:2298292