Image GalleryFour-Cell Human Embryo |
![Four-Cell Human Embryo [Click for next image]](http://media.ehd.org/images/prenatal_numbered_491/four-cell-human-embryo.jpg "Click for next image")
 From The Biology of Prenatal Development. |
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| All ages referenced to fertilization, not last menstrual period. |
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Four-Cell Human Embryo
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Four-Cell Embryo
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Five-Cell Embryo
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Six-Cell Embryo
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Seven-Cell Embryo
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Eight-Cell Embryo
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