| 21. | A zygote initially develops into a hollow sphere, called a blastula, which undergoes rearrangement and differentiation.
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| 22. | Epiboly in zebrafish is the first coordinated cell movement, and begins once the embryo has completed the blastula stage.
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| 23. | It includes a blastula, gastrula and a four armed echinopluteus stage that forms an important part of the zooplankton.
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| 24. | The first three to four months are spent with the blastula in suspended development before it implants itself in the uterus.
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| 25. | In the mammalian blastocyst ( term for mammalian blastula ) there are three lineages that give rise to later tissue development.
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| 26. | One concern is that blastula creation in SCNT-based human stem cell research will lead to the reproductive cloning of humans.
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| 27. | These fossils show the cleavage stage, and the blastula, but the identity of the adult forms is not yet unknown.
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| 28. | From the stage of having 128 cells, the embryo develops a cavity, the blastocoele, and is called a blastula.
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| 29. | The blastocyst must not be confused with the blastula; even though they are similar in structure, their cells have different fates.
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| 30. | The anterior / posterior axis lies along the animal / vegetal axis set up during nuclei at the vegetal pole of the blastula.
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