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Ref : 001102-07 - © 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 (blue & red) are twisted into a double helix. Linking the helices, like the rungs of a ladder, are pairs of organic bases; adenine & thymine (blue & yellow) and guanine & cytosine (green & purple). Yellow & red dots indicate concave areas of the molecular surface, whereas blue dots indicate convex regions. Hydrogen atoms are not shown. |