JOHN MCLEAN / SCIENCE PHOTO LIBRARY JOHN MCLEAN / SCIENCE PHOTO LIBRARY
DNA autoradiogram. Autoradiograms show the genetic sequence of nucleotide bases in DNA (deoxyribonucleic acid). This sequence is unique for every individual. DNA controls the development and functioning of every living organism. The four DNA bases are: adenine, thymine, guanine and cytosine.
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