MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
IVF. Conceptual computer artwork depicting a micro-needle injecting a human sperm into a human egg cell. This technique, used in in vitro fertilisation (IVF), is known as intracytoplasmic sperm injection (ICSI). The egg is fertilised by the sperm, resulting in the formation of a zygote. The zygote is then grown in the lab until it reaches an early stage of embryonic development. It is then implanted in the 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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