http://biology.kenyon.edu/courses/biol63/watson_06.pdf
http://academic.brooklyn.cuny.edu/biology/bio4fv/page/molecular%20biolog...
http://tigger.uic.edu/classes/phys/phys461/phys450/ANJUM04/
http://www.whatislife.com/reader/dna-rna/dna-rna.html
http://www.livescience.com/37247-dna.html
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