MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
In vitro fertilization. Surgeon implanting embryos into a woman's uterus during in vitro fertilization (IVF) treatment. The embryos, known as blastocysts, are at an early stage of their development. They were created by the micro- injection of sperm into eggs surgically removed from the woman's ovaries. The resulting fertilized eggs (zygotes) were allowed to develop into blastocysts in the laboratory. Following implantation, pregnancy proceeds as normal. IVF treatment enables couples with a variety of infertility problems to conceive.
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