In vitro fertilization (IVF). Light micrograph of a human egg (centre) injected with a micro-needle (right) that contains a single sperm. This type of
In vitro fertilization (IVF). Light micrograph of a human egg (centre) injected with a micro-needle (right) that contains a single sperm. This type of IVF is known as intra-cytoplasmic sperm injection (ICSI). The injected sperm fertilizes the egg and the resulting zygote is cultured until it reaches an early stage of embryonic development. It is then implanted into the uterus, allowing pregnancy to proceed as normal. IVF treatment enables couples with a range of infertility problems to conceive a child.
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Photo credit: © ZEPHYR/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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