Mitosis. Light micrograph of a roundworm (Ascaris sp.) egg cell during early anaphase of mitosis (nuclear division). Mitosis is the formation of two daughter nuclei from one parent nucleus. At anaphase sister chromatids, which are made of deoxyribonucleic acid (DNA, black), are moved to separate poles by spindles (pink lines). Two identical chromatids make up one chromosome, so each cell retains a copy of the parent cell's genetic information. Spindles are made up of microtubules, part of the cell's cytoskeleton. Magnification: x1800 when printed at 10 centimetres wide.
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