CARLOS CLARIVAN / SCIENCE PHOTO LIBRARY CARLOS CLARIVAN / SCIENCE PHOTO LIBRARY
DNA molecules, computer illustration. Three models representing the structure of a DNA (deoxyribonucleic acid) molecule. DNA is composed of two strands twisted into a double helix. The strands consist of nucleotides, the sequence of which encodes the body's genetic information. On the left, the model shows individual atoms, in the middle is a simplified twisted ladder model, and on the right, the nucleotide bases are shown.
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