BSIP, LAURENT / SCIENCE PHOTO LIBRARY BSIP, LAURENT / SCIENCE PHOTO LIBRARY
Blood samples. Bags containing blood on a hospital laboratory bench. Technicians in haematology departments of hospitals determine the blood group of samples and screen them for the presence of pathogens, such as viruses and bacteria. Blood bags are labelled with the blood group to ensure that the correct type is given in a blood transfusion.
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