Structures of complement component C3 provide insights into the function and evolution of immunity.
Janssen, B.J., Huizinga, E.G., Raaijmakers, H.C., Roos, A., Daha, M.R., Nilsson-Ekdahl, K., Nilsson, B., Gros, P.(2005) Nature 437: 505-511
- PubMed: 16177781 
- DOI: 10.1038/nature04005
- Primary Citation of Related Structures:  
2A74, 2A73 - PubMed Abstract: 
The mammalian complement system is a phylogenetically ancient cascade system that has a major role in innate and adaptive immunity. Activation of component C3 (1,641 residues) is central to the three complement pathways and results in inflammation and elimination of self and non-self targets ...