1. Option in Bioengineering, Beckman Institute, Pasadena, CA 91125, USA.
2. Biological Imaging Center, Beckman Institute, Pasadena, CA 91125, USA.
3. Graduate Aeronautical Laboratories, California Institute of Technology (Caltech), Pasadena, CA 91125, USA.
4. Institute of Molecular and Cellular Biology, National Taiwan University, Taiwan.
5. Genome Research Institute, University of Cincinnati, Cincinnati, OH 45221, USA.