1Phoenix Biomolecular Engineering Foundation, San Francisco, CA, USA
2University of Wisconsin, Madison, WI, USA
3Bruker BioSpin, The Woodlands, TX, USA
4National Institutes of Health, National Nuclear Magnetic Resonance Facility, Madison, WI, USA
5San Francisco State University, San Francisco, CA, USA
6Bruker Optics, Fitchburg, WI, USA
7Preliminary results of this work were presented at the 62nd Annual Meeting of the American Society of Human Genetics, November 6-10, 2012, San Francisco, California, USA