Inner cell mass
Inner cell mass
Early embryonic mass that gives rise to the fetus.
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Readers' pathsAug 2026 – Oct 2026
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Blastocyst
Structure formed around day 5 of mammalian embryonic development.
50%
Trophoblast
Early embryonic structure that gives rise to the placenta.
28%
Hypoblast
Embryonic inner cell mass tissue that forms the yolk sac and, later, chorion.
6.3%
Animal embryonic development
Process by which animal embryos form and develop.
5.9%
Epiblast
Cells that give rise to the embryo in amniote development.
5%
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Blastocyst
Structure formed around day 5 of mammalian embryonic development.
45%
Blastulation
Sphere of cells formed during early embryonic development in animals.
13%
Epiblast
Cells that give rise to the embryo in amniote development.
12%
Stem cell
Unspecialized biological cell that can become specialized.
12%
Embryonic stem cell
Type of pluripotent blastocystic stem cell.
4.4%
Marsupial
Infraclass of mammals in the clade Metatheria.
2.3%
Blastocoel
Fluid-filled or yolk-filled cavity that forms in the blastula.
2.3%
Bilaminar embryonic disc
Embryonic cell structure.
2.3%
Hypoblast
Embryonic inner cell mass tissue that forms the yolk sac and, later, chorion.
2.3%
Cell potency
Ability of a cell to differentiate into other cell types.
2.3%