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DNA autoradiogram. Female scientist's face reflected in a computer screen showing the results of a DNA (deoxyribonucleic acid) autoradiogram. The autoradiogram shows the sequence of nucleotide bases in a sample of DNA. There are four types of bases in DNA: adenine (A), cytosine (C), thymine (T) and guanine (G). The sequence of these bases make up genes, which encode an organism's genetic information.
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