1. G. Alkhatib, C. C. Broder, Y. Feng, P. E. Kennedy, E. A. Berger, Laboratory of Viral Diseases, National Institute of Allergy and Infectious Diseases (NIAID), National Institutes of Health (NIH), Bethesda, MD 20892, USA
2. C. Combadiere and P. M. Murphy, Laboratory of Host Defenses, NIAID, NIH, Bethesda, MD 20892, USA.