CHRIS PRIEST / SCIENCE PHOTO LIBRARY CHRIS PRIEST / SCIENCE PHOTO LIBRARY
In vitro fertilisation (IVF). Embryo transfer by a gynaecologist. Fertilised embryos are injected via a syringe and catheter into the uterine cavity. In IVF, fertility drugs are given to potential mothers to stimulate the production of several ova rather than just one. These are then harvested, usually by laparoscopy, and fertilised in a petri dish, using a fresh or frozen sample of the husband's sperm. If fert- ilisation is successful, the embryos are incubated for up to 42 hours and then transferred into the woman's uterus. Photographed at Bart's Hospital, London.
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