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| Description: By the end of the third day there are 16 cells. Each division yields smaller and smaller cells (blastomeres). By the fourth day the cluster of cells resembles a mulberry and is called a morula. It is still surrounded by the zona pellucida and is still the size of the zygote. Picture Stats: Views: 176 Filesize: 305.82kB Height: 358 Width: 628 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40481 |