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| Description: Embryonic tissue invades the uterine wall and erodes uterine blood vessels. Blood fills spaces called lacunae. By the end of the second week, chorionic villi develop. Picture Stats: Views: 175 Filesize: 477.26kB Height: 454 Width: 670 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40511 |