MICHAEL WHITAKER / SCIENCE PHOTO LIBRARY MICHAEL WHITAKER / SCIENCE PHOTO LIBRARY
Egg cell division. Confocal light micrograph of four stages of cell division (mitosis) of a sea urchin egg. Chromosomes are blue; red microtubules are concentrated in cell regions (yellow). At top left metaphase is seen, in which chromosomes align along the cell equator. In anaphase (top right) the chromosomes move to opposite poles of the cell pulled by microtubules; by telophase (bottom left) the chromosomes are fully separated. Cytokinesis (bottom right) is the division of the cytoplasm into two daughter cells. The egg cell divides to produce an embryo. A confocal microscope uses fluorescent dye on the specimen and a laser to scan the image. Magnification: x200 at 6x6cm size.
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