title: WITHDRAWN: Response Letter to the Editor.
abstract: This article has been withdrawn at the request of the editor. The Publisher apologizes for any inconvenience this may cause. The full Elsevier Policy on Article Withdrawal can be found at http://www.elsevier.com/locate/withdrawalpolicy.
authors: Department of Molecular and Cellular Biology, University of Arizona, Tucson, AZ 85721, United States.
authors: Alvin J
authors: AJ
authors: Clark