The information inside a DNA molecule is encoded by the nucleotide bases adenine, thymine, guanine and cytosine (A, T, G and C).

• DNA分子携带的资讯是由核苷酸碱基腺嘌呤（A）、胸腺嘧啶（T）、鸟嘌呤（G）及胞嘧啶（C）所编写。