<prompt> Wilsons disease is caused by defect in:ATP 7A mutationATP 7B mutationCeruloplasminATP 7C mutation  <response>: b. ATP 7B mutationRef: Nelsons 20e p 1939-1940, Ghai 8e p 320-321The abnormal gene for Wilson disease is ATP7B on long arm of chromosome 13 13q14.3 