每种颜色对应四种核苷酸中的一种。

Each color corresponds to one of four nucleotides.

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研究了一种核苷酸制剂的免疫调节作用。

Study on immunoreaction of one dose type from nucleotides acid.

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DNA和RNA都是由核苷酸构成，每一单元为由三部分组成的分子，一端是磷酸盐，中部是一种糖，另一端是碱基。

DNA and RNA are made of nucleotides. Each unit is a three-part molecule with a phosphate at one end, a sugar in the middle and a variable nucleobase at the other end.

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