DNA, otherwise known as deoxyribonucleic acid, is the molecule that stores your genetic information. As you might imagine, the instruction manual for
making you (or any other type of critter) can be very large, so it's not too surprising that a single molecule of DNA can be enormous — so big, in fact, that under the right circumstances you can see a DNA molecule with the naked eye. (To find out how, see the sidebar "A DNA cocktail: Extracting DNA at home.")
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