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Zygote, primitive yolk sac - Coggle Diagram
Zygote
Day 1
blastomeres:
undergoes its first cleavage, producing two identical daughter cells
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primitive yolk sac
Day12-13
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Exocoelomic Cysts:
The pinched-off remnants of the primitive yolk sac fragment into transient vesicles found within the extraembryonic coelom
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