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(1992) Vivian Emerson, department head of Home Office, looking at DNA radiograms at the Forensic Science Service in Aldermaston, England. DNA consists of two sugar- phosphate backbones, arranged in a double helix, linked by nucleotide bases. There are 4 types of base; adenine (A), cytosine (C), guanine (G) and thymine (T). Sequences of these bases make up genes, which encode an organism's genetic information. The bands (black) on the autoradiogram show the sequence of bases in a sample of DNA. DNA Fingerprinting. MODEL RELEASED

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(1992) Vivian Emerson, department head of Home Office, looking at DNA radiograms at the Forensic Science Service in Aldermaston, England. DNA consists of two sugar- phosphate backbones, arranged in a double helix, linked by nucleotide bases. There are 4 types of base; adenine (A), cytosine (C), guanine (G) and thymine (T). Sequences of these bases make up genes, which encode an organism's genetic information. The bands (black) on the autoradiogram show the sequence of bases in a sample of DNA. DNA Fingerprinting. MODEL RELEASED