DNA: Ìyàtọ̀ láàrin àwọn àtúnyẹ̀wò
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Ìlà 18:
[[File:DNA orbit animated static thumb.png|thumb|upright|A section of DNA. The bases lie horizontally between the two spiraling strands.<ref>Created from [http://www.rcsb.org/pdb/cgi/explore.cgi?pdbId=1D65 PDB 1D65]</ref> Animated version at [[:File:DNA orbit animated.gif]].]]
The nucleobases are classified into two types: the [[purine]]s, A and G, being fused five- and six-membered [[heterocyclic compound]]s, and the [[pyrimidine]]s, the six-membered rings C and T.<ref name=berg/> A fifth pyrimidine nucleobase, [[uracil]] (U), usually takes the place of thymine in RNA and differs from thymine by lacking a [[methyl group]] on its ring. Uracil is not usually found in DNA, occurring only as a breakdown product of cytosine. In addition to RNA and DNA a large number of artificial [[nucleic acid analogues]] have also been created to study the proprieties of nucleic acids, or for use in biotechnology.<ref>{{cite journal |author=Verma S, Eckstein F |title=Modified oligonucleotides: synthesis and strategy for users |journal=Annu. Rev. Biochem. |volume=67 |pages=99–134 |year=1998 |pmid=9759484 |doi=10.1146/annurev.biochem.67.1.99}}</ref>
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