This family of proteins is functionally uncharacterised. This family of proteins is found in eukaryotes. Proteins in this family are typically between 288 and 410 amino acids in length. There are two completely conserved C residues that may be functionally important. In mammals this protein family is thyroid-specific [1].

1: Initial characterization of C16orf89, a novel thyroid-specific gene. Afink GB, Veenboer G, de Randamie J, Keijser R, Meischl C, Niessen H, Ris-Stalpers C; Thyroid. 2010;20:811-821. PMID:20578903