Granulocyte white blood cell. Coloured transmission electron micrograph (TEM) of a neutrophil granulocyte, a type of white blood cell. Neutrophils, like all white blood cells, are part of the body's immune system. They are involved in the body's immune response and help to defend the body from pathogens. Granules within their cytoplasm contain enzymes used to destroy invading organisms. Like all granulocytes, neutrophils have a multi-lobed nucleus (yellow and purple). Magnification: x8570 at 35mm.