Department of Informatics, J. Craig Venter Institute, Rockville, MD, USA.|Department of Informatics, J. Craig Venter Institute, Rockville, MD, USA.|Department of Informatics, J. Craig Venter Institute, Rockville, MD, USA.|Department of Informatics, J. Craig Venter Institute, Rockville, MD, USA.|Department of Informatics, J. Craig Venter Institute, Rockville, MD, USA.|Department of Informatics, J. Craig Venter Institute, Rockville, MD, USA.