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Cytosine

1) Cytosine (C) is one of four chemical bases in DNA, the other three being adenine (A), guanine (G), and thymine (T). Within the DNA molecule, cytosine bases located on one strand form chemical bonds with guanine bases on the opposite strand. The sequence of four DNA bases encodes the cell's genetic instructions.

2) A pyrimidine base (C4H5N3O) that codes genetic information in the polynucleotide chain of DNA or RNA.

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cytosine
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One of the four nitrogenous 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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One of the pyrimidine nitrogenous bases occurring in both DNA and RNA.

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A pyrimidine base found in DNA and RNA.

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