ARNO MASSEE / SCIENCE PHOTO LIBRARY ARNO MASSEE / SCIENCE PHOTO LIBRARY
Storing genetic material. Researcher removing a tray of vials containing human tissue samples taken from a freezer. The DNA (deoxyribonucleic acid) in these tissues will be extracted and used to investigate the origins of inherited disorders. Cryogenic (sub-zero) storage of the cells preserves them indefinitely. Photographed at Leiden University Medical Centre, Leiden, The Netherlands.
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