DAVID BECKER / SCIENCE PHOTO LIBRARY DAVID BECKER / SCIENCE PHOTO LIBRARY
Culture cell. Confocal light micrograph of a 3t3 (mouse fibroblast) cell in culture. The nucleus is red and actin is green. Actin is a structural protein that forms part of a cell's cytoskeleton. The cytoskeleton is a network of structural proteins that supports the cell's organelles. Magnification: x1000 when printed 10cm wide.
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