BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Transmission Electron Micrograph (TEM) of Cricosphaera carterae, a coccolithophorid, golden-brown plankton organism of the class Prymnesiophyceae; 2 coccoliths (discs of calcite) formed inside the cell are seen at left in exocytosis vesicles, one about to fuse with cell membrane. Magnification 20,000X at 4x4' image size.
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