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| Description: A head fold and a tail fold develop. All major organs develop between the 4th through 8th weeks (organogenesis). Embryonic folding occurs during the 4th week. This involves the flat embryo folding into a three-dimensional cylinder. Picture Stats: Views: 141 Filesize: 625.71kB Height: 391 Width: 1350 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40516 |