About the Authors

Susan M Baxter

To whom correspondence should be addressed. E-mail: smb@ncgr.org

Steven W Day
Jacquelyn S Fetrow
Stephanie J Reisinger

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

SMB and SJR conceived and designed the experiments. SWD and JSF analyzed the data. SWD and JSF contributed reagents/materials/analysis tools. SMB, SWD, JSF, and SJR wrote the paper.