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| Description: Many amphibian eggs have a dark pigment concentrated in cytoplasm near the animal pole. At fertilization, the cytoplasm shifts, and exposes a gray crescent-shaped region just opposite the sperm’s entry point. The first cleavage normally distributes half of the gray crescent to each descendant cell. Picture Stats: Views: 147 Filesize: 146.01kB Height: 1500 Width: 801 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=47368 |