| abstract |
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, X1 represents O, S or Se, and X2 represents SH (or S−), S or Se−, a CI-4 alkyl or a morpholino group.) |