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Veterinary Embryology 8.1 - 8.4
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Pregunta:
Primitive streak formation
Autor: Magdalena Badenhorst
Respuesta:
A dull, thickened stripe develops in the middle of the epiblast in the caudal half of the embryonal disc. It is formed by the medial and caudal migration of proliferating epiblast cells Continued cell migration causes cranial elongation of the primitive streak until it extends over all but the cranial third of the embryonal disc.
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Respuesta alternativas:
On the epiblast surface, a primitive streak forms as differential cell growth generates a pair of ridges separated by a depression.
Autor
Magdalena Badenhorst