About the Authors
Department of Biological Chemistry, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California, United States of America
Resource for the Visualization of Biological Complexity, Wadsworth Center, Albany, New York, United States of America
Electron Microscope Laboratory, University of California Berkeley, Berkeley, California, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: TK MZ AH KM CM AvdB. Performed the experiments: TK MZ AH AW EN KB KM CM. Wrote the paper: AvdB.