There was an error published in Biol. Open4, 980-992.
The statements regarding funding were incomplete and the following text has now been included in the Funding section:
This work was supported by the Fondation pour la Recherche Médicale, grant number [DEQ20140329501] to P.D.
Biology Open and the authors apologise to the readers for any confusion that this omission might have caused.
© 2016. Published by The Company of Biologists Ltd
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