White blood cells, SEM
White blood cells. Coloured scanning electron micrograph (SEM) of the five types of white blood cells found in peripheral blood. Neutrophil top left, monocyte top right, lymphocyte bottom left, eosinophil center and a basophil bottom right. White blood cells are involved in defending the body against both infectious disease and foreign materials. Magnification: x4500 when printed at 10 centimetres wide., by STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY
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