They Were Made Without Eggs or Sperm. Are They Human?
The truth is, though, that the earliest stages of human development are still very much a mystery. Early-stage embryos are ...
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The First Two Cells in a Human Embryo Contribute Disproportionately to Fetal Development
4 “We know so little about the very early stages of human development,” said Nicolas Plachta, a developmental biologist at the University of Pennsylvania who was not involved with the study. To ...