The second anniversary of my request for help to position the four vortices Fleury claims is rapidly approaching and I was looking around for something relevant to make a celebration poster.

I opened The Mechanisms Underlying Primitive Streak Formation in the Chick Embryo, by Manli Chuai and Cornelis J. Weijer1 for inspiration and of course Fleury’s webpage with his english short presentation.

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This is an old question which never received an answer. And certainly an answer wasn’t required before the publication of cteappv. As everything in the paper is about clarification and one more particular point remain unclear, I’ll post my question here and maybe Vincent Fleury will be kind enough to provide an answer.

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