defined:

One of the four bases in DNA that make up the letters ATGC, guanine is the "G". The others are adenine, cytosine, and thymine. Guanine always pairs with cytosine.

explained:

Listen to a detailed explanation. (Requires the free RealPlayer download)

Dr. Robert Nussbaum, formerly of the National Human Genome Research Institute's Laboratory of Genetic Disease Research, defines guanine.

illustrated:

View illustration

related
terms:

base pair, cytosine, deoxyribonucleic acid (DNA), ribonucleic acid (RNA), protein, genetic code (ATGC), nucleotide, uracil

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