ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
In vitro fertilization (IVF). Light micrograph of a human egg (centre) about to be pierced by a micro-needle (right) that contains a single sperm. This type of IVF is known as intracytoplasmic 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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