STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
White blood cells. Coloured scanning electron micrograph (SEM), showing white blood cells present in a urine sample taken from someone with a urinary tract infection (UTI). The number of white blood cells in urine sediment is normally low. When the number is high, it indicates an infection or inflammation somewhere in the urinary tract. Magnification: x2600 when printed to centimetres wide.
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