title: Letter to the Editor: Reply to Becker and Morgan.
authors.affiliation: Department of Medicine, Division of Medical Genetics, University of Washington, Seattle, Washington, robinb@u.washington.edu.
authors.forename: Robin L
authors.initials: RL
authors.lastname: Bennett
authors.forename: Arno G
authors.initials: AG
authors.lastname: Motulsky
authors.forename: Alan H
authors.initials: AH
authors.lastname: Bittles