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DNA autoradiographs. Banded DNA sequences or genetic "fingerprints" overlapping on a computer screen. The bands represent the sequence of bases that form the genetic code in DNA (deoxyribonucleic acid) molecules. To make an autoradiograph a DNA sample is cut into fragments by an enzyme and marked with radioactive tags. The fragments are then placed in a gel and separated by electrophoresis, the application of an electric charge. Placing a radiographic film on the gel produces a radiograph of the resulting DNA bands, which can be analysed and compared for similarity to other DNA samples.
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