HENNING DALHOFF / SCIENCE PHOTO LIBRARY HENNING DALHOFF / SCIENCE PHOTO LIBRARY
DNA packaging. Computer artwork showing how DNA (deoxyribonucleic acid) is packaged within cells. Two DNA strands, consisting of a sugar-phosphate backbone attached to nucleotide bases, twist into a double helix (left). The DNA double helix is tightly coiled around histone proteins (green spheres) which are tightly packaged together in groups of eight to form nucleosomes (upper right). These are then coiled together (centre) and further packaged into chromosomes (centre right). Each human cell contains 23 pairs of chromosomes, which contain all the body's genetic information.
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