1. Department of Immunology, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA.
2. Hartwell Center for Bioinformatics and Biotechnology, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA.
3. Animal Resources Center and the Veterinary Pathology Core, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA.