Examples of blastocyst in the following topics:
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- A zygote undergoes rapid cell divisions (cleavage) to form a spherical ball of cells: the blastula; this will further develop into a blastocyst.
- Mammals at this stage form a structure called the blastocyst, characterized by an inner cell mass that is distinct from the surrounding blastula.
- In mammals, the blastula forms the blastocyst in the next stage of development.
- The rearrangement of the cells in the mammalian blastula to two layers, the inner cell mass and the trophoblast, results in the formation of the blastocyst.
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- In humans, approximately four days after fertilization and after several cycles of cell division, these cells begin to specialize, forming a hollow sphere of cells, called a blastocyst.
- The blastocyst has an outer layer of cells, and inside this hollow sphere, there is a cluster of cells called the inner cell mass.
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- The outer layers of the zygote (blastocyst) grow into the endometrium by digesting the endometrial cells.
- Wound healing of the endometrium closes up the blastocyst into the tissue.
- Another layer of the blastocyst, the chorion, begins releasing a hormone called human chorionic gonadotropin (hCG) which makes its way to the corpus luteum, keeping it active.
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- The zygote divides to form a blastocyst and, upon entering the uterus, implants in the endometrium, beginning pregnancy.
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- In mammals, there are two broad types of stem cells: embryonic stem cells, which are isolated from the inner cell mass of blastocysts, and adult stem cells, which are found in various tissues.
- Pluripotent, embryonic stem cells originate as inner cell mass (ICM) cells within a blastocyst.
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- The nucleus from a second sheep was then introduced into the cell, which was allowed to divide to the blastocyst stage before being implanted in a surrogate mother.