MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
DNA double helix. Computer artwork of a DNA (deoxyribonucleic acid) double helix. The normal helical structure is formed when the genetic coding components (called nucleotide bases) pair together to form horizontal bonds (transparent). The angles of the bonds of the nucleotide bases force the DNA backbones (green) to twist around themselves.
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