| 21. | Research can only be performed on an embryo for a maximum of fourteen days or until the primitive streak appears.
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| 22. | Amphioxus forms an epithelial neural tube and dorsal notochord but does not have the EMT potential of the primitive streak.
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| 23. | The neural plate will form opposite the primitive streak from ectodermal tissue which thickens and flattens into the neural plate.
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| 24. | Transplantation of the PMZ results in induction of a primitive streak, however, PMZ does not contribute to the streak itself.
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| 25. | The lateral plate and the extraembryonic mesoderm arise from the cells that enter at the posterior end of the primitive streak.
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| 26. | The Foundation has collaborated with many scientists, notably Primitive Streak, Mental, Wonderland, Eye & I and Dress of Glass and Flame.
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| 27. | A primitive node ( or primitive knot ) forms in front of the primitive streak which is the organiser of neurulation.
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| 28. | The first wave of epiblast cells to invaginate through the primitive streak invades and displaces the hypoblast to become the embryonic endoderm.
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| 29. | Otx2 is a group of homeobox genes that are typically described as a head organizer in the primitive streak stage of embryonic development.
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| 30. | In the first 14 days of life, the embryo has not yet developed a " primitive streak, " the precursor to a backbone.
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