AJ PHOTO / SCIENCE PHOTO LIBRARY AJ PHOTO / SCIENCE PHOTO LIBRARY
Biological research. Frozen cell samples in test tubes awaiting analysis. Cell samples such as these are stored in a cryostat, a piece of equipment used in the process of cyropreservation. Cells can be preserved by cooling them to sub- zero temperatures. This effectively stops any biological activity that could lead to cell death. Photographed at the Genethon Laboratory, near Paris, France.
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