gray crescent
The gray crescent is a characteristic feature of the early embryo of some animals, including frogs and sea urchins. It is a light gray area on the dorsal side of the embryo, which is caused by the displacement of pigmented cytoplasm during fertilization. The gray crescent is important because it identifies the future axis of the embryo, and is involved in the formation of the notochord, neural tube, and other key structures during development.
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