PHILIPPE PLAILLY / SCIENCE PHOTO LIBRARY PHILIPPE PLAILLY / SCIENCE PHOTO LIBRARY
Blood serum. Tubes of human serum in a rack. Serum is the suspension in which blood cells and clotting agents are found. When these blood cells are removed by centrifugation, a clear serum fluid remains. Serum contains salts, glucose, and other proteins, including antibodies formed by the body's immune system to protect against infection. Serum can therefore be analysed for antibodies to viruses such as hepatitis C or HIV that the patient may have contracted.
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