cholesterol receptor contains 18 exons that encode 5 domains
in the protein.
Exons 2-6 comprise the domain for the binding site for cholesterol.
The next 8 exons comprise a domain homologous to the mouse hormone epidermal growth factor (EGF). A similar domain is also found in many other polypeptides, including 3 blood-clotting proteins.
Other exons specify 3 domains that perform specific functions.