Cutting edge: Human anaphylatoxin C4a is a potent agonist of the guinea pig but not the human C3a receptor

Stefan Lienenklaus, Robert S. Ames, Mark A. Tornetta, Henry M. Sarau, James J. Foley, Torsten Crass, Bettina Sohns, Ute Raffetseder, Melanie Grove, Anja Hölzer, Andreas Klos, Jörg Köhl, Wilfried Bautsch^*