ODN 1826 sodium is a class B CpG ODN (oligodeoxynucleotide) that is a TLR9 agonist. ODN 1826 sodium is an immunostimulatory agent that induces NO and iNOS production in mouse models. ODN 1826 sodium also enhances apoptosis ( apoptosis ) and may promote atherosclerosis. ODN 1826 sequence: 5’-tccatgacgttcctgacgtt-3’.