CHASSENET / BSIP / SCIENCE PHOTO LIBRARY CHASSENET / BSIP / SCIENCE PHOTO LIBRARY
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IVF embryo. Light micrograph of a four-cell embryo created by in vitro fertilisation (IVF). This embryo will be implanted in the patient's uterus. Several embryos are usually implanted to give the greatest chance of a successful pregnancy. However, this can result in multiple births. IVF allows infertile couples to conceive a child.
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