T651嘌呤002-NZH30ONHNHH鸟嘌岭G腺嘌呤A
腺嘌呤 A 嘌 呤 鸟嘌呤 G
453N密啶261NHCH3HHH尿嘧啶U胞嘧啶胸腺嘧啶T
嘧 啶 胞嘧啶 C 胸腺嘧啶 T 尿嘧啶 U
Adenine (A)Guanine (G)NH2HHH2NH1Purines
NH2HHHHThymine (T)Cytosine (C)Uracil (U)Pyrimidines
NH2NH2HHAdenine (A)Cytosine (C)OHNHHGuanine (G)Thymine (T)Uracil (U)