MD-2 residues tyrosine 42, arginine 69, aspartic acid 122, and leucine 125 provide species specificity for lipid IVA.
Meng J, Drolet JR, Monks BG, Golenbock DT. MD-2 residues tyrosine 42, arginine 69, aspartic acid 122, and leucine 125 provide species specificity for lipid IVA. J Biol Chem. 2010 Sep 03; 285(36):27935-43.