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It seems you are mistakenFor embryonic stem cell research, they continue the growing process, past the point needed for impregnation.
From the following:
Embryonic stem cells, as their name suggests, are derived from embryos. Most embryonic stem cells are derived from embryos that develop from eggs that have been fertilized in vitro—in an in vitro fertilization clinic—and then donated for research purposes with informed consent of the donors. They are not derived from eggs fertilized in a woman's body.
https://stemcells.nih.gov/info/basics/3.htm