Human chromosome pair No. 4, coloured scanning electron micrograph (SEM). There are 23 pairs of chromosomes in most normal human cells. These are allocated pairs 1 - 22 with pair 23 being the sex chromosomes, either xx for females or xy for males. Magnification; x8625 at 10cm wide.

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Photo credit: © POWER AND SYRED/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
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