Tri-Lys Negative control for Tri-DAP L-Ala-γ-D-Glu-Lys (Tri-Lys) is a tripeptide present in the peptidoglycan (PGN) of Gram-positive bacteria. Tri-Lys is not recognized by NOD1 (CARD4), in contrast to Tri-DAP which is found mainly in Gram-negative bacteria. Thus Tri-Lys can be used as a negative control for NOD1 activation studies with Tri-DAP. Working Concentration: 100 ng - 10 µg/ml Endotoxin level: <0.125 EU/ml Solubility: 10 mg/ml in water Synonym: L-alanyl-γ-D-glutamyl-Lysine Formula: C14H26N4O6 Molecular weight: 346.38