ARTURO LONDONO, ISM / SCIENCE PHOTO LIBRARY ARTURO LONDONO, ISM / SCIENCE PHOTO LIBRARY
FISH (fluorescence in-situ hybridisation) light micrograph of human chromosomes, showing telomeres (red and green dots) on chromosomes (blue, G and C strands). Telomeres are structures which protect the ends of the chromosome and may play a key role in cell aging.
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