PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY
Embryo ultrasound scan. Ultrasound scan of an early embryo conceived through in vitro fertilisation (IVF) implanted in the wall of the uterus. The uterine cavity is the dark oval at centre, with the tiny implanted embryo seen as the blue dot near its left edge. For IVF, sperm was introduced to the mother's egg in a laboratory. After fertilisation, the embryo was incubated for a few days before being implanted into the woman's uterus. This ultrasound scan was taken to ensure that implantation had occurred properly. Ultrasound uses high-frequency sound waves to build up a picture of the body's internal structures.
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