PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY
Abnormal chromosomes. Light micrograph of abnormal chromosomes (black) after exposure to methyl methane sulphonate (MMS), a cancer-causing chemical. Chromosomes are the structures inside cells that form from the genetic material (DNA) during cell division. Abnormalities in the chromosome structure (as at centre right) show that the DNA has been damaged. This can lead to disorders like cancer. 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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