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B-lymphocyte. Coloured Transmission Electron Micrograph of a section through a B-lymphocyte white blood cell. The cell's large nucleus is yellow and purple. It's surface is covered with tiny ridges and projections called microvilli, which help it bind to target proteins. On encountering a foreign antigen, such as a bacterial surface protein, the immature B-cell either divides into a number of plasma cells, which produce antibodies that kill the invader, or it matures into a memory cell. Memory cells remain in the body for years, giving immunity to the original pathogen. Magnification x6000 at 6x6cm size.
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