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| Description: The primitive streak establishes the head and tail ends of the embryo. Next, cells of the epiblast move inward below the primitive streak and undergo invagination. Following this, the three germ layers form. Picture Stats: Views: 175 Filesize: 782.02kB Height: 630 Width: 1350 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40492 |