ODN 1826 control (ODN 2138) Negative control for ODN 1826 ODN 1826 Control (ODN 2138) contains GpC dinucleotides instead of CpGs and can be used as a negative control for ODN 1826 (type B specific for murine TLR9). Synonym: ODN 2138 Working concentration: 5 µM (10 μg/ml) Solubility: 5 mg/ml in water ODN 1826 Control sequence 5’- tcc atg agc ttc ctg agc tt -3’ (20 mer) Note: Bases are phosphorothioate (nuclease resistant). Quality control - The absence of bacterial contamination (endotoxins, peptidoglycans) is controlled using HEK-Blue™ TLR2 and HEK-Blue™ TLR4 cells.