| abstract |
The purpose of the present invention is to provide a double-stranded oligonucleotide comprising the CpG oligonucleotides mentioned below, as a nucleic acid derivative having an immunostimulatory activity. An adjuvant comprising a double-stranded oligonucleotide, wherein a first strand is a CpG oligonucleotide which is composed of 8 to 50 nucleotides, a second strand is an oligonucleotide which is composed of 8 to 60 nucleotides and contains a sequence capable of hybridizing with the first strand, and a lipid is bonded to the second strand through a linker or without a linker. |