HANK MORGAN / SCIENCE PHOTO LIBRARY HANK MORGAN / SCIENCE PHOTO LIBRARY
In vitro fertilisation (IVF): technician removing frozen embryos from storage. In IVF, fertility drugs are given to potential mothers to stimulate the production of several ova, rather than the usual one. These are then harvested, usually by laparoscopy, and are fertilised in a petri dish, using a fresh or frozen sample of the husband's sperm. If fertilisation is successful, the embryos are incubated for up to 42 hours and then transferred back into the woman's uterus via a catheter inserted through the cervix. Any surplus embryos can be frozen and stored for possible future use.
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