This family is the central conserved 110 amino acid region of a group of proteins called telomere-length regulation or clock abnormal protein-2 which are conserved from plants to humans. The full-length protein regulates telomere length and contributes to silencing of sub-telomeric regions. In vitro the protein binds to telomeric DNA repeats.

1: The C. elegans maternal-effect gene clk-2 is essential for embryonic development, encodes a protein homologous to yeast Tel2p and affects telomere length. Benard C, McCright B, Zhang Y, Felkai S, Lakowski B, Hekimi S; Development. 2001;128:4045-4055. PMID:11641227