JOHN MCLEAN / SCIENCE PHOTO LIBRARY JOHN MCLEAN / SCIENCE PHOTO LIBRARY
Embryo selection. Technician at an in vitro fertilisation (IVF) clinic examining embryos under a microscope. The embryos have been produced by fertilising harvested eggs with sperm cells in a laboratory. The technician selects the healthy embryos, which will then either be transferred to the patient's womb (uterus), or frozen for future use. IVF enables couples with a wide range of fertility problems to conceive a child.
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