Provided are an isolated oligonucleotide and a use thereof in nucleic acid sequencing, wherein the isolated oligonucleotide comprises a first strand, wherein the 5'-end nucleotide of the first strand has a phosphate group, and the 3'-end nucleotide of the first strand is a dideoxynucleotide, and a second strand, wherein the 5'-end nucleotide of the second strand does not have a phosphate group, and the 3'-end nucleotide of the second strand is a dideoxynucleotide, wherein the first strand is longer than the second strand in length, and a double-stranded structure is formed between the first strand and the second strand.
提供了一种分离的寡核苷酸及其在核酸测序中的用途,其中分离的寡核苷酸包括第一链,其中第一链的5'-端核苷酸具有
磷酸基团,第一链的3'-端核苷酸是二脱氧核苷酸,以及第二链、其中第二链的 5'- 端核苷酸没有
磷酸基团,第二链的 3'- 端核苷酸是双脱氧核苷酸,其中第一链的长度长于第二链,第一链和第二链之间形成双链结构。