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| Description: By the middle of the 4th week, upper limb buds begin to develop. By the end of the 4th week, lower limb buds and the heart prominence form. At the end of the 4th week, the embryo has a tail. Picture Stats: Views: 214 Filesize: 294.6kB Height: 425 Width: 652 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40523 |