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DNA chameleon colors. Left-handed Z-DNA has a zig-zag backbone resulting from the dinucleotide repeat with alternating syn- and anti-bases. In contrast, the backbone of right-handed B-DNA is smooth as all the bases have an anti-conformation. The phosphate oxygens are red, the phosphorous atom orange and the gray spheres represent deoxyribose carbons. The small blue circles are base nitrogens while the small red circles base oxygens.
