1. Imutran Ltd. (a Novartis Pharma AG company), Post Office Box 399, Cambridge CB2 2YP, UK.
2. Genetic Therapy Inc. (a Novartis company), Gaithersburg, MD 20878, USA.
3. Centers for Disease Control and Prevention (National Center for Infectious Diseases, Division of AIDS, STD, and TB Laboratory Research, HIV and Retrovirology Branch), Atlanta, GA 30333, USA.
4. Q-One Biotech Ltd. and Department of Veterinary Pathology, University of Glasgow, Glasgow G20 OXA, UK.