Zwei Meter des Moleküls Desoxyribonukleinsäure (DNA), der Trägerin unserer Erbinformation, befinden sich in jedem Kern einer menschlichen Zelle. Die DNA muss daher sorgsam verpackt werden. Sie wickelt sich dabei zunächst um bestimmte Proteine. Diese mit kleinen Spulen vergleichbaren Strukturen aus DNA
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