JIM DOWDALLS / SCIENCE PHOTO LIBRARY JIM DOWDALLS / SCIENCE PHOTO LIBRARY
Illustration of the host immune response initiated by the presence of a foreign pathogen or by damage from disease. Cytokines from macrophage cells stimulate the blood vessels to release albumin, a straw-coloured liquid containing red blood cells, platelets and white blood cells, into the surrounding tissue. This causes edema, the accumulation of fluid in intercellular spaces of tissues.
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