R-form LPS, the master key to the activation of TLR4/MD-2-positive cells - Michael Huber; Christoph Kalis; Simone Keck; Zheng Fan Jiang; Philippe Georgel; Xin Du; Louis Shamel; Sosathya Sovath; Suzanne Mudd; Bruce Beutler; Chris Galanos; Marina A. Freudenberg (European Journal of Immunology, 2006)