BSIP, LAURENT / SCIENCE PHOTO LIBRARY BSIP, LAURENT / SCIENCE PHOTO LIBRARY
DNA sequencing. Male technician holding a DNA sample in a test tube in front of genetic sequences or DNA fingerprints on a computer monitor. A compact strand of DNA (deoxyribonucleic acid, white) is seen in the test tube. Each of the coloured bands on the monitor represents one of four chemical bases called nucleotides. The genetic code is formed by the sequence of these bases.
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