An overwhelming percentage of noncoding DNA in eukaryotes serves no known biological role and whether most of them evolve without selection constraints remains in debates.

• 在真核基因组中占有绝大多数的非编码DNA似乎没有明显的生物学功能，而它们在进化过程中的变化是否受到选择压力的限制迄今仍不明了。