May play a role during embryogenesis. Gene duplication of the ancestral BCNT gene leads to the h-type BCNT (CFDP1) gene and the p97BCNT (CFDP2) gene. The latter contains a region derived from the endonuclease domain of a retrotransposable element RTE-1. This repetitive sequence associated with the BCNT gene is specific to Ruminantia.