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| Description: By about the 17th day after fertilization, paired, cube-shaped structures called somites form. By the end of the 5th week, 42–44 pairs are present. Each somite differentiates into a myotome, a dermatome and a sclerotome. Picture Stats: Views: 162 Filesize: 262.57kB Height: 444 Width: 670 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40508 |