1. Biomedical Sciences ProgramUniversity of California, San Diego9500 Gilman Dr., Basic Science Building Rm. 1000La JollaCA92093‐0608USA
2. National Center for Microscopy and Imaging ResearchUniversity of California, San Diego9500 Gilman Dr., Basic Science Building Rm. 1000La JollaCA92093‐0608USA
3. Department of NeurosciencesUniversity of California, San Diego9500 Gilman Dr., Basic Science Building Rm. 1000La JollaCA92093‐0608USA