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VOLKER STEGER / SCIENCE PHOTO LIBRARY VOLKER STEGER / SCIENCE PHOTO LIBRARY
Gene mapping. Deoxyribonucleic Acid (DNA) autorad- iograms prepared as part of gene mapping studies. Banding patterns on the autoradiogram form a genetic fingerprint. The banding pattern shows the sequence of base pairs that form the code for a section of DNA. A sample of DNA has been cut into fragments by an enzyme and marked with a radioactive tag for sequencing. The DNA fragments are then separated by electrophoresis in an agarose gel, moving different distances along the gel according to size. The resulting banding pattern is preserved on X-ray film to produce this autoradiogram.
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