These last two are rarely used in biology, but they are like analogs for nucleobases — the same core molecule but structurally slightly different.

后两个在生物学中很少使用，但它们像碱基的类似物一样—具有相同的核心分子，但是在结构上略有不同。

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These last two are rarely used in biology, but they are like analogs for nucleobases — the same core molecule but structurally slightly different.

后两个在生物学中很少使用，但它们像碱基的类似物一样—具有相同的核心分子，但是在结构上略有不同。

youdao