PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY
Hamster chromosomes. Light micrograph of normal chromosomes (purple) from a hamster. This hamster has 44 chromosomes. For abnormal chromosomes, see M352/052. Chromosomes are the structures inside cells that form from the genetic material (DNA) during cell division. Photographed in the Health and Pollutants Laboratory of the INRS (the French National Institute of Research and Safety), Nancy, France. Tests are carried out here to establish the toxicity and cancer-causing properties of different materials, chemicals and pollutants.
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