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Human chromosomes, light micrograph
Fluorescent light micrograph of human chromosomes. Fluorescent markers have been used to highlight DNA (deoxyribonucleic acid, blue) and kinetochores (green). During mitosis (nuclear division), the formation of two daughter nuclei from one parent nucleus, the spindle apparatus that separates' sister chromatids attaches to the chromosomes via the kinetochores. Two identical chromatids make up one chromosome, so each cell retains a copy of the parent cell's genetic information., by DR. JUAN F. GIMENEZ-ABIAN / SCIENCE PHOTO LIBRARY
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