EVAN OTO / SCIENCE PHOTO LIBRARY EVAN OTO / SCIENCE PHOTO LIBRARY
A computer generated illustration of sickle-cell disease. With sickle-cell disease, red blood cells contort into a crescent or sickle-like shape due to a mutation in the oxygen-carrying protein haemoglobin. This can lead to a disease known as sickle-cell anaemia, which can affect bloodflow and the amount of oxygen delivered in the body.
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