Department of Genetics, Stanford University, Department of Pathology, Stanford University, Genome Scale Measurements Group, National Institute of Standards and Technology, Stanford, CA, USA and.|Genome Scale Measurements Group, National Institute of Standards and Technology, Gaithersburg, MD, USA.|Genome Scale Measurements Group, National Institute of Standards and Technology, Stanford, CA, USA and.|Department of Genetics, Stanford University, Department of Pathology, Stanford University.