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History
- Received November 26, 2018
- Revision received February 20, 2019
- Accepted February 23, 2019
- First published March 18, 2019.
- Version of record published May 15, 2019.
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Copyright © 2019 the authors
Author Information
Author contributions
Author contributions: L.K. and C.E.C. designed research; L.K. and C.E.C. performed research; L.K. and C.E.C. contributed unpublished reagents/analytic tools; L.K. analyzed data; L.K. and C.E.C. wrote the paper.
Disclosures
- Received November 26, 2018.
- Revision received February 20, 2019.
- Accepted February 23, 2019.
This work was supported by National Institutes of Health Grant DCD000436. We thank Paula Kuokkanen, Janie Ondracek, Uwe Firzlaff, and Harald Luksch for advice and comments on the manuscript; Sharad Shanbhag and Go Ashida for programming and updating tytology; Ruth Elsey (Rockefeller Wildlife Refuge) for help with collecting American alligators; and Hilary Bierman for helping with head size measurements.
The authors declare no competing financial interests.
- Correspondence should be addressed to Lutz Kettler at lutz.kettler{at}tum.de
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