[1] Howard Hughes Med Inst, Janelia Farm Res Consortium Imaging Transcript, Ashburn, VA 20147 USA
[2] Ecole Normale Super, CNRS, UMR 8541, F-75230 Paris 5, France
[3] Univ Calif Berkeley, Howard Hughes Med Inst, Dept Mol & Cell Biol, Berkeley, CA 94720 USA
[4] Yeshiva Univ, Albert Einstein Coll Med, Dept Anat & Struct Biol, Gruss Lipper Biophoton Ctr, Bronx, NY 10461 USA