Plasma cell. Coloured transmission electron micrograph of a plasma cell from bone marrow. Plasma cells are mature B-lymphocyte white blood cells that secrete antibodies during an immune response. Characteristic of plasma cells is the arrangement of heterochromatin (orange) in the nucleus, which adheres to the inner nuclear membrane. Also typical is the network of rough endoplasmic reticulum (yellow dotted lines) in the cytoplasm, where antibody synthesis occurs on ribosomes (dots). The oval or rounded crimson structures in the cytoplasm are energy-producing mitochondria. Magnification x4,500 at 6x6cm size.
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