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![Pronounciation of
cytosine](https://webarchive.library.unt.edu/eot2008/20090131020708im_/http://www.genome.gov/Images/Glossary/Pronounciation/cytosine.gif)
defined: |
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One of the four bases in DNA that make up the letters ATGC, cytosine is the "C". The others are adenine, guanine, and thymine. Cytosine always pairs with guanine.
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explained: |
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Listen to a detailed explanation.
Dr. Robert Nussbaum, formerly of the National Human Genome Research Institute's Laboratory of Genetic Disease Research, defines cytosine.
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illustrated: |
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View illustration
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related terms: |
![](https://webarchive.library.unt.edu/eot2008/20090131020708im_/http://www.genome.gov/Images/spacer2.gif) |
base pair,
deoxyribonucleic acid (DNA),
ribonucleic acid (RNA),
protein,
genetic code (ATGC),
nucleotide,
guanine,
uracil |
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