单词	cytosine
释义	cytosine /ˈsʌɪtəsiːn / noun [mass noun] Biochemistry A compound found in living tissue as a constituent base of DNA. It is paired with guanine in double-stranded DNA. A pyrimidine derivative; chemical formula: C4H5N3O. The nitrogen-containing units are the bases: adenine, cytosine, guanine, and uracil.... In DNA the bases pair to form a ladder-like structure, with adenine paired with thymine and guanine with cytosine. The derivatives of purine are called adenine and guanine, and the derivatives of pyrimidine are called thymine, cytosine and uracil.
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