1 Histocompatibility, Immunogenetics, and Disease Profiling Laboratory, Stanford Blood Center, Palo Alto, CA, USA. Electronic address: tamara.vayntrub@stanford.edu.
2 Center for Genetics, Children's Hospital Oakland Research Institute, Oakland, CA, USA. Electronic address: sjmack@chori.org.
3 Histocompatibility, Immunogenetics, and Disease Profiling Laboratory, Stanford Blood Center, Palo Alto, CA, USA; Department of Pathology, Stanford University Medical Center, Stanford, CA, USA. Electronic address: marcelof@stanford.edu.