1. Laboratory for Cellular Medicine, Beckman Research Institute, City of Hope, CA 91010.
2. Current address:Centre for Blood Cell Therapies at Peter McCallum Center, Melbourne 3002, Australia.
3. Current address:Nodality, Inc., South San Francisco, CA 94088.
4. Department of Molecular Biology, Beckman Research Institute, City of Hope, CA 91010.
5. Division of Information Sciences, City of Hope, CA 91010.
6. Department of Virology, Beckman Research Institute, City of Hope, CA 91010.