| Affiliation: | (1) Division of Biology, 147-75, California Institute of Technology, 91125 Pasadena, CA, USA;(2) Howard Hughes Medical Institute and Departments of Microbiology and Biochemistry, University of Texas Southwestern Medical Center, 75235-9050 Dallas, TX, USA;(3) Present address: Department of Medicine, University of North Carolina, 27599 Chapel Hill, NC, USA;(4) Present address: Department of Microbiology and Immunology, University of California, 90024 Los Angeles, CA, USA;(5) Present address: Gene Screen Corp., Dallas, TX 75207, USA |
