DR PAUL ANDREWS, UNIVERSITY OF DUNDEE / SCIENCE PHOTO LIBRARY DR PAUL ANDREWS, UNIVERSITY OF DUNDEE / SCIENCE PHOTO LIBRARY
Cytokinesis. Fluorescent micrograph of an animal cell during cytokinesis (cell division). Cytokinesis occurs after nuclear division (mitosis), which produces two daughter nuclei, containing deoxyribonucleic acid (DNA, white). A contractile ring made of actin filaments (red) forms beneath the cell's plasma membrane. This ring contracts, creating a furrow in the cytoplasm. The furrow deepens, separating the cytoplasm and cell organelles, until the two new cells are formed. The blue structures are microtubules, part of the cell's cytoskeleton, they separate the chromosomes during mitosis.
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