About the Authors

Heng Tao

Affiliation Perlegen Sciences, Mountain View, California, United States of America

David R Cox

Affiliation Perlegen Sciences, Mountain View, California, United States of America

Kelly A Frazer

To whom correspondence should be addressed. E-mail: Kelly_Frazer@perlegen.com

Affiliation Perlegen Sciences, Mountain View, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

DRC and KAF conceived and designed the experiments. HT performed the experiments. HT and KAF analyzed the data. KAF wrote the paper.