About the Authors
Department of Molecular Biology and Biochemistry, Wesleyan University, Middletown, Connecticut, United States of America
Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, Connecticut, United States of America
Department of Developmental Biology, Stanford University, Stanford, California, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: AJM AMV KV-M SSM. Performed the experiments: KV-M SSM AJM. Analyzed the data: KV-M SSM PL AJM. Contributed reagents/materials/analysis tools: PL. Wrote the paper: AJM.