DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
Animal sperm storage. Scientist in mask and gloves withdrawing from a canister a straw containing frozen semen of an endangered animal. The semen is stored in liquid nitrogen at -196 degrees Celsius. This forms part of research concerned with preserving the genetic diversity of animal species threatened with extinction. Photographed in the Institute of Zoology, London, England.
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