1. Department of Pathology and
Laboratory Medicine,
University of Pennsylvania,
Philadelphia, PA 19104, USA, and
Wistar Institute,
Philadelphia, PA 19104, USA
2. Department of Pathology and
Laboratory Medicine,
University of Pennsylvania, USA
3. R&D Systems,
Minneapolis, MN 55413, USA
4. Wistar Institute,
Philadelphia, PA 19104, USA
5. Children's Hospital,
Department of Pediatrics,
Boston, MA 02115, USA
6. Department of Cancer
Immunology and AIDS,
Dana-Farbar Cancer Institute,
Boston, MA 02115, USA
7. Department of Microbiology and Immunology,
Uniformed Services University,
Bethesda, MD 20814–4799, USA