MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
DNA autoradiogram and codons, artwork. Autoradiograms show the order of nucleotide bases (basic building blocks) in a sample of DNA (deoxyribonucleic acid). The bases are represented as the letters A, C, G and T and occur in sets of three, which are called codons.
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