1. Department of Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.
2. National Resource for Automated Molecular Microscopy, Department of Cell Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.
3. Department of Pathology, University of Utah School of Medicine, Salt Lake City, UT 84112, USA.
4. Department of Microbiology, University of Alabama at Birmingham, Birmingham, AL 35294, USA.