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an unfertilized egg
Blastocyst
blastocyst The most versatile stem cells occur earliest in life. As a fertilized human egg divides, it first becomes a solid ball of cells, the morula. Next, about five days after fertilization, it becomes a hollow ball, the blastocyst. The cells of the outer layer of the blastocyst eventually form part of the placenta.
In order to obtain stem cells, an embryo must be in the blastocyst stage.
When an embryo (fertilized egg) reaches the uterus, it is a hollow ball of about 100 cells called a blastocyst.
About 100 cells make up a blastocyst.
They make up the placenta that provides the blastocyst with nutrients.
Blastocyst. Each of those cells will eventually become a different part of the baby's body as they each multiply, creating muscle, bone, and organ tissues.
A blastocyst is a distinctive stage of a mamalian embryo. It is a form of Blastula that develops from a berry like cluster of cells, the morula. It continues to form and grow from there.
100
an unfertilized egg
Blastocyst
Blastocyst
A blastocyst.
Blastocyst
Blastocyst.