DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
Conceptual computer illustration of a man displaying initials of the nucleotide bases of DNA: cytosine, adenine, guanine, and thymine. Behind him is a graphic presentation of an autoradiograph showing bands of DNA produced by the technique of electrophoresis in an agarose gel. The pattern of these DNA bands is unique to each individual, but some bands are shared by related people, such as a parent & child. DNA fingerprints can be used to prove conclusively whether people are related.
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