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metal prints base pair metal prints base pairs metal prints biochemical metal prints biological metal prints cellular metal prints chromosomes metal prints coiling metal prints cytological metal prints histone metal prints label metal prints labels metal prints no-one metal prints nobody metal prints nucleic acids metal prints nucleosomes metal prints

photographs base pair photos base pairs photos biochemical photos biological photos cellular photos chromosomes photos coiling photos cytological photos histone photos label photos labels photos no-one photos nobody photos nucleic acids photos nucleosomes photos

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Cellular packaging of DNA. Illustration of the packaging of deoxyribonucleic acid (DNA) from chromosome (centre left) to the DNA strand form and its nucleotide base pairs (upper right). Between these states, the DNA winds tightly into coils that wrap around protein structures called histones to form units called nucleosomes (both at lower right). Further coiling forms strands of chromatin, which condenses during cell division to form structures called chromosomes. DNA is found in the cell nucleus, shown in a cutaway view of a cell at far left. DNA forms the genetic basis of nearly all living organisms. The DNA in a cell nucleus (less than 0.1 millimetres across) is over 2 metres in length when unravelled. For this illustration without labels, see image C046/9213.

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