BSIP, LAURENT / SCIENCE PHOTO LIBRARY BSIP, LAURENT / SCIENCE PHOTO LIBRARY
DNA sequencing. Female technician studying the banded DNA sequences or genetic fingerprints of an autoradiogram. A computer graphic of part of a molecule of DNA (deoxyribonucleic acid) is seen on the computer monitor. Each of the bands on the autoradiogram represents one of four chemical bases called nucleotides. The genetic code is formed by the sequence of these bases. The autoradiogram was produced by placing a radiographic film on a gel containing radioactively-tagged fragments of DNA. DNA sequencing is used in forensic science and medical research.
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