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DNA replication, illustration
Illustration of a DNA (deoxyribonucleic acid) molecule (left) replicating. DNA is composed of two strands twisted into a double helix, held together by bonds between paired nucleotide bases. Before replication, the strands separate from each other. Each strand then each acts as a template for the formation of two new DNA molecules (right). This is known as semiconservative replication. DNA contains sections called genes, which encode the body's genetic information., by ALI DAMOUH/SCIENCE PHOTO LIBRARY
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