DNA strands in living cells normally have a right-hand twist–just like a standard wood or metal screw. The Left-Handed DNA Hall of Fame, maintained by Tom Schneider of the Laboratory of Experimental and Computational Biology at the National Institutes of Health, offers an amusing compendium of examples in which illustrators have unwittingly depicted DNA incorrectly in its mirror-image, left-handed form.
Go to: http://www-lmmb.ncifcrf.gov/~toms/LeftHanded.DNA.html
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