POWER AND SYRED / SCIENCE PHOTO LIBRARY POWER AND SYRED / SCIENCE PHOTO LIBRARY
Light micrograph of a sample of normal human blood, showing numerous erythrocytes (red blood cells) and four leucocytes (white blood cells) with purple-stained, lobed nuclei. There are three major divisions of leucocytes: granulocytes, lymphocytes and monocytes. Together, they are involved in protecting the body against the invasion of foreign substances and in antibody production. Magnification: x400 at 35mm size.
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