LAGUNA DESIGN / SCIENCE PHOTO LIBRARY LAGUNA DESIGN / SCIENCE PHOTO LIBRARY
Conceptual illustration of a test-tube with a DNA (deoxyribonucleic acid) molecule in a liquid. DNA is composed of two strands twisted into a double helix. Each strand consists of a sugar-phosphate backbone attached to nucleotide bases. DNA contains sections called genes that encode the body's genetic information.
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