About the Authors

Rajeev K Azad

Affiliation Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America

Jeffrey G Lawrence

To whom correspondence should be addressed. E-mail: jlawrenc@pitt.edu

Affiliation Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

RKA and JGL conceived and designed the experiment. RKA performed the experiments. RKA and JGL analyzed the data and wrote the paper.