JEANETTE ENGQVIST / SCIENCE PHOTO LIBRARY JEANETTE ENGQVIST / SCIENCE PHOTO LIBRARY
Cell division. Computer illustration of a cell undergoing mitosis (nuclear division) and cytokinesis (cell division) to form two identical daughter cells (centre). Clockwise from top; Interphase: the cell is at rest - chromatin can be seen in the nucleus (dark, round). Prophase: the chromatin begins to condense into chromosomes, centrosomes (yellow) are seen and microtubules (lines) have invaded the nuclear space. Metaphase: chromosomes align along the centre of the cell. Anaphase: chromosomes split and the microtubules shorten. Telophase: chromosomes begin to decondense and are surrounded by newly formed nuclear envelopes (dark) - cytokinesis has already begun. Cytokinesis: the cell splits into two new daughter cells.
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