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Understanding SCID

Your immune system is made up of many different white blood cells. They destroy anything unfamiliar in your body, including bacteria and viruses, which can all cause illness. In boys with X-linked SCID, some of these 'defender cells' do not develop and grow properly. This is because they have no working version of a gene that normally makes a protein found on the surface of these cells.

Red and white blood cells.
Red and white blood cells.
National Medical Slide Bank/Wellcome Photo Library

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