mì
(phonetic) as in pyrimidine
bāo mì dìng
cytosine nucleotide (C, pairs with guanine G 鳥嘌呤|鸟嘌呤 in DNA and RNA)
xiōng xiàn mì dìng
thymine nucleotide (T, pairs with adenine A 腺嘌呤 in DNA)
niào mì dìng
uracil nucleotide (U, pairs with adenine A 腺嘌呤 in RNA)