The Cordon-bleu protein domain is highly conserved among vertebrates. The sequence contains three repeated lysine, arginine, and proline-rich regions, the KKRAP motif. The exact function of the protein is unknown but it is thought to be involved in mid-brain neural tube closure. It is expressed specifically in the node [1]. This domain has a ubiquitin-like fold.

1: Cordon-bleu is a conserved gene involved in neural tube formation. Carroll EA, Gerrelli D, Gasca S, Berg E, Beier DR, Copp AJ, Klingensmith J; Dev Biol. 2003;262:16-31. PMID:14512015