ODN 2007 sodium, a class B CpG ODN (oligodeoxynucleotide), is a Toll-like receptor ( TLR ) ligand. ODN 2007 sodium can be used as an immunomodulator, vaccine adjuvant , and enhance immune responses in mammals, fish, and humans. ODN 2007 sequence: 5'-TCGTCGTTGTCGTTTTGTCGTT-3'.