MICHAEL DONNE / SCIENCE PHOTO LIBRARY MICHAEL DONNE / SCIENCE PHOTO LIBRARY
Blood donation. Pile of coloured keyrings labelled with the different blood groups (A, B, AB and O) and Rhesus factor types (positive or negative). It is vital that the same blood group is given to a patient during a transfusion. If a different type is given clotting occurs, which can prove fatal. These keyrings are given to blood donors by the National Blood Service (of England and North Wales).
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