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blastodisc[Gk. blastos, sprout + discos, a round plate] Disklike area on the surface of a large, yolky egg that undergoes cleavage and gives rise to the embryo.
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blastodisc(n) a layer of cells on the inside of the blastula
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blastodiscA small whitish spot on the surface of the Egg Yolk where cleavage begins. Upon Fertilization the Cytoplasm streams from the vegetal pole away from the yolk to the Animal pole where cleavage will occu [..]
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blastodisc
blastodisk|lang=en
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