Cutting Edge: Targeted Disruption of the C3a Receptor Gene Demonstrates a Novel Protective Anti-Inflammatory Role for C3a in Endotoxin-Shock Jens Kildsgaard, Travis J. Hollmann, Kirstin W. Matthews, Ka Bian, Ferid Murad, and Rick A. Wetsel J Immunol 2000 165:5406-5409; doi:10.4049/jimmunol.165.10.5406