48.0 MB (8.6 MB compressed)
4931 x 3399 pixels
41.7 x 28.7 cm ⏐ 16.4 x 11.3 in (300dpi)
CNRI / SCIENCE PHOTO LIBRARY CNRI / SCIENCE PHOTO LIBRARY
False-colour transmission electron micrograph (TEM) of a human plasmocyte. Plasmocytes are mature B-lymphocytes (white blood cells) that synthesize & secrete the antibodies of the immune system. Characteristic of a plasma cell is the parallel array of the rough endoplasmic reticulum, (red, at left), the cisternae (elements) of which become dilated with antibodies (immunoglobulins). Antibodies produced by a single plasma cell are of one specificity and immunoglobulin class. Another typical feature is the quantity of heterochromatin (red) which adheres to the inner nuclear membrane x2,800 at 35mm size.
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