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uracil nucleotide (U, pairs with adenine A 腺嘌呤 in RNA)
cytosine nucleotide (C, pairs with guanine G 鳥嘌呤|鸟嘌呤 in DNA and RNA)
thymine nucleotide (T, pairs with adenine A 腺嘌呤 in DNA)
idine (chemistry)
(phonetic) as in pyrimidine