1. Center for Cell and Gene Therapy, Baylor College of Medicine, The Methodist Hospital, and Texas Children's Hospital, Houston, TX 77030.
2. Department of Immunology, Baylor College of Medicine, Houston, TX 77030.
3. Present address: Department of Melanoma Medical Oncology and Center for Cancer Immunology Research, The University of Texas M.D. Anderson Cancer Center, Houston, TX 77030.
4. Department of Bioengineering, Rice University, Houston, TX 77005.
5. Departments of Immunology and Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030.