CFC domain is one half of the membrane protein Cripto, a protein overexpressed in many tumours [1,2] and structurally similar to the C-terminal extracellular portions of Jagged 1 and Jagged 2 [1]. CFC is approx 40-residues long, compacted by three internal disulphide bridges, and binds Alk4 via a hydrophobic patch. CFC is structurally homologous to the VWFC-like domain [1].

1: The CRIPTO/FRL-1/CRYPTIC (CFC) domain of human Cripto. Functional and structural insights through disulfide structure analysis. Foley SF, van Vlijmen HW, Boynton RE, Adkins HB, Cheung AE, Singh J, Sanicola M, Young CN, Wen D; Eur J Biochem. 2003;270:3610-3618. PMID:12919325

2: Solution structure of mouse Cripto CFC domain and its inactive variant Trp107Ala. Calvanese L, Saporito A, Marasco D, D'Auria G, Minchiotti G, Pedone C, Paolillo L, Falcigno L, Ruvo M; J Med Chem. 2006;49:7054-7062. PMID:17125258