Genes: X To use the sharing features on this page, please enable JavaScript. Explore the normal functions of human genes and the health implications of genetic changes. Other genes A-Z Expand Section A B C D E F G H I J K L M N O P Q R S T U V W X Y Z XDH: xanthine dehydrogenase XIAP: X-linked inhibitor of apoptosis XK: X-linked Kx blood group antigen, Kell and VPS13A binding protein XPA: XPA, DNA damage recognition and repair factor XPC: XPC complex subunit, DNA damage recognition and repair factor