1. Laboratory of Molecular Biology, National Cancer Institute, NIH, Bethesda, MD 20892
2. Laboratory of High Resolution Optical Imaging, National Institute of Biomedical Imaging and Bioengineering, NIH, Bethesda, MD 20892
3. HHMI, Ashburn, VA 20147
4. Advanced Imaging and Microscopy Resource, NIH, Bethesda, MD 20892