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A. L'œsophage dérive de l'ectoblaste.B. L'endoderme a un rôle nécessaire pour induire la formation des tubes endothéliaux du réseau vasculaire.C. La plaque neurale et le tube neural sont à l'origine des systèmes nerveux central et périphérique.D. Le mésoblaste intermédiaire est localisé latéralement, de part et d'autre des somites.E. Dès la 5° semaine de développement, les premiers vaisseaux apparaissent dans le mésenchyme extra-embryonnaire.

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