Fig. 4: The Four Nitrogenous Bases
in DNA: Adenine, Guanine, Cytosine, and Thymine
Adenine and guanine are also known
as purine bases; cytosine and thymine are also called pyrimidine bases. Each
deoxyribonucleotide will contain one of these four bases.
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Gary E. Kaiser
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Updated: Nov. 2, 2005
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