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Article History

Received: 5 February 2018

Accepted: 15 August 2018

First Online: 30 August 2018

Ethics approval and consent to participate

: Collection and handling of catshark and ray embryos were carried out in full compliance of institutional, national and international guidelines [French Décret n° 2013–118 du 1er février 2013; European Communities Council Directive of 22 September 2010 (2010/63/UE)] and did not require further approval by an ethics committee.The Ethics Committee of the University of Concepcion (Concepcion, Chile) approved all experimental procedures carried out during this study with Xenopus embryonic stages, which were performed following the guidelines outlined in the Biosafety and Bioethics Manual of the National Commission of Scientific and Technological Research (CONICYT, Chilean Government).

: Not applicable.

: The authors declare that they have no competing interests.

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