KEITH CHAMBERS / SCIENCE PHOTO LIBRARY KEITH CHAMBERS / SCIENCE PHOTO LIBRARY
DNA strands. Computer illustration showing the structure of double stranded DNA (deoxyribonucleic acid) molecules. DNA is composed of two strands twisted into a double helix. Each strand consists of a sugar-phosphate backbone (curved) attached to nucleotide bases. There are four bases: adenine, cytosine, guanine and thymine. DNA contains sections called genes that encode the body's genetic information.
Model release not required. Property release not required.