1. N. J. Deacon, A. Tsykin, A. Solomon, K. Smith, M. Ludford-Menting, D. J. Hooker, AIDS Molecular Biology Unit, National Centre for HIV Virology Research, Macfarlane Burnet Centre for Medical Research, Yarra Bend Road, Fairfield, Victoria 3078, Australia.
2. D. A. McPhee, A. L. Greenway, A. Ellett, C. Chatfield, V. A. Lawson, AIDS Cellular Biology Unit, National Centre for HIV Virology Research, Macfarlane Burnet Centre for Medical Research, Yarra Bend Road, Fairfield, Victoria 3078, Australia.
3. S. Crowe, A. Maerz, S. Sonza, AIDS Pathogenesis Unit, National Centre for HIV Virology Research, Macfarlane Burnet Centre for Medical Research, Yarra Bend Road, Fairfield, Victoria 3078, Australia.
4. J. Learmont and J. S. Sullivan, New South Wales Red Cross Blood Transfusion Service, Sydney, New South Wales 2000, Australia.
5. A. Cunningham, D. Dwyer, D. Dowton, Department of Virology and the National Centre for HIV Virology Research, Institute of Clinical Pathology and Medical Research, Westmead Hospital, Westmead, New South Wales 2145, Australia.
6. J. Mills, National Centre for HIV Virology Research, Macfarlane Burnet Centre for Medical Research, Yarra Bend Road, Fairfield, Victoria 3078, Australia.