About the Authors

Michelle T. Graham

Affiliation Department of Laboratory Medicine, University of California San Francisco, San Francisco, California, United States of America

Clare L. Abram

Affiliation Department of Laboratory Medicine, University of California San Francisco, San Francisco, California, United States of America

Yongmei Hu

Affiliation Department of Laboratory Medicine, University of California San Francisco, San Francisco, California, United States of America

Clifford A. Lowell

clifford.lowell@ucsf.edu

Affiliation Department of Laboratory Medicine, University of California San Francisco, San Francisco, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MTG CLA CAL. Performed the experiments: MTG CLA YH CAL. Analyzed the data: MTG CAL. Wrote the manuscript: MTG CLA CAL.