Genome Technology Branch, National Human Genome Research Institute, National Institutes of Health, Building 49, Room 2C-76, Bethesda, MD 20892-4431, USA.|Genome Technology Branch, National Human Genome Research Institute, National Institutes of Health, Building 49, Room 2C-76, Bethesda, MD 20892-4431, USA.|Genome Technology Branch, National Human Genome Research Institute, National Institutes of Health, Building 49, Room 2C-76, Bethesda, MD 20892-4431, USA.|Genome Technology Branch, National Human Genome Research Institute, National Institutes of Health, Building 49, Room 2C-76, Bethesda, MD 20892-4431, USA.