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Ref : 001109-07 - © Jean-Claude RÉVY - ISM Computer graphics representation of a short section of DNA (deoxyribonucleic acid, B form). The two strands of the sugar-phosphate backbone are twisted into a double helix. Linking the helices, like the rungs of a ladder, are pairs of organic bases; adenine & thymine, guanine & cytosine. This simulation of the smoothed surface ( tracing, beta-spline fonction) reveals alternating major & minor grooves in the structure. Hydrogen atoms are not shown. |