GWEN SHOCKEY / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY GWEN SHOCKEY / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY
Illustration of sickle cells and normal red blood cells. Sickle cell anaemia is a severe hereditary form of anaemia in which a mutated form of haemoglobin distorts the red blood cells into a crescent shape at low oxygen levels. It is common in those of African descent.
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