PETER COHEN / CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY PETER COHEN / CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Cell mitosis. Illustration of a cell during the anaphase stage of mitosis (cell division). At centre are white spindle microtubules or fibres along which divided chromosomes (chromatids) are pulled to opposite poles of the cell. Chromatids are ribbon shaped (brown). Cytoplasm of the cell appears granular outside of the spindle. During anaphase of mitosis, nuclear (DNA) division is completed with the formation of sister chromatids, and this genetic material ends up at opposite poles of the spindle. From this process, two separate nuclei can form, one for each new cell. An aster (star of tubules) is seen at lower right.
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