CUZD1 is a 607 amino acid single-pass type I membrane protein that contains two CUB domains and a ZP (zona-pellucida) domain. Expressed in pancreas and epithelium of ovary, CUZD1 is found at high levels in ovarian tumors where it is thought to inhibit cell attachment and proliferation. CUZD1 is suggested to play a role in cell motility, cell-cell interactions and/or interactions with the extracellular matrices. Existing as three alternatively spliced isoforms, CUZD1 is encoded by a gene located on human chromosome 10. Making up 4.5% of the human genome, chromosome 10 encodes roughly 800 genes including PTEN, a tumor suppressor gene that has been linked to the development of Cowden syndrome. The chromosome 10 encoded gene ERCC6 is important for DNA repair and is linked to Cockayne syndrome which is characterized by extreme photosensitivity and premature aging.