Departments of ^aGenetics

^bBioengineering, Stanford University, Stanford, California, USA

Correspondence to Dr Teri E. Klein, PhD, Department of Genetics, Stanford University Medical Center, 300 Pasteur Dr. Lane L301, Mail Code: 5120, Stanford, CA 94305-5120, USA

Tel: +1 650 725 0659; fax: +1 650 725 3863;

e-mail: [email protected]

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Received 18 November 2008 Accepted 5 February 2009