About the Authors
Department of Cellular and Molecular Pharmacology, University of California, San Francisco, California, United States of America
The authors have declared that no competing interests exist.
MRVG and KRY conceived and designed the experiments. MRVG, HH, and AJ performed the experiments. MRVG analyzed the data. MRVG contributed reagents/materials/analysis tools. MRVG and KRY wrote the paper.