POWER AND SYRED / SCIENCE PHOTO LIBRARY POWER AND SYRED / SCIENCE PHOTO LIBRARY
Male human sex chromosomes X and Y (Pair 23), scanning electron micrograph (SEM). There are 23 pairs of chromosomes in most normal human cells. These are allocated pairs 1 to 22 with pair 23 being the sex chromosomes, either xx for females and xy for males. Magnification x17,500 at 10 cm wide.
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