| As a result, the blastodisc on the yolk becomes a blastoderm. |
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| Early cell divisions were evident at the animal pole and eventually formed the blastodisc. |
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| During this period dividing cells were easily distinguishable prior to blastodisc formation, and little change in morphometry occurs. |
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| The teleost embryo first appears as a clump of cells along the thickened margin of the blastodisc. |
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