About the Authors

Lin-Xi Li

lxli@ucdavis.edu

Affiliation Center for Comparative Medicine, Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California, Davis, Davis, California, United States of America

Stephen J. McSorley

Affiliation Center for Comparative Medicine, Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California, Davis, Davis, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: LXL SJM. Performed the experiments: LXL. Analyzed the data: LXL. Wrote the paper: LXL SJM.