Background of the antigen
CPXCR1 is widely expressed in fetal tissues, including the tongue, mandible and palate with an unknown function. Cleft palate most commonly occurs as a sporadic multifactorial disorder with a clear but difficult to define genetic component. As a semi-dominant disorder, X-linked cleft palate (CPX) provides a useful model to investigate a congenital defect that is little influenced by non-genetic factors.