The disclosures of the Specification provide an oligonucleotide derivative suited to practical use, as well as a fluorescent dye cluster and use therefor. The disclosures of the Specification use a labeling agent comprising a plurality of nucleotide derivative units represented by Formula (1) below:
(where, Z represents a nitrogen atom or CH, Y represents an uncondensed aromatic hydrocarbon group or condensed polycyclic hydrocarbon group, X
1
represents O, S or Se, and X
2
represents SH (or S
−
), S or Se
−
, a C
I-4
alkyl or a morpholino group.)
本规范的披露提供了适用于实际使用的寡核苷酸衍
生物,以及荧光
染料簇及其使用。本规范的披露使用包含由下式(1)表示的多个核苷酸衍
生物单元的标记剂:(其中,Z表示氮原子或CH,Y表示未缩合的芳香族碳氢基团或缩合的多环碳氢基团,X1表示O,S或Se,X2表示SH(或S−),S或Se−,CI-4烷基或morpholino基团。)