PHILLIP HAYSON / SCIENCE PHOTO LIBRARY PHILLIP HAYSON / SCIENCE PHOTO LIBRARY
Sperm bank. Several microtubules (or straws) of cryogenically stored (frozen) sperm being removed from a storage tank. This container is filled with liquid nitrogen, which keeps its contents at minus 196 degrees Celsius. After a sample is removed and thawed, the healthiest sperm cells are selected by a computer imaging system. Such sperm are then used for in vitro fertilisation (IVF), usually to treat infertile couples.
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