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Fertilization and implantation in humans.
Fertilization and implantation in humans.
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Eight-cell embryo, at three days
Eight-cell embryo, at three days
Histogenesis of the three germ layers
Histogenesis of the three germ layers
Embryo attached to placenta in amniotic cavity
Embryo attached to placenta in amniotic cavity
Nine-week-old human embryo from an ectopic pregnancy
Nine-week-old human embryo from an ectopic pregnancy