Several crystallographic structures of<unk>  have been determined and reveal that this protein contains 13 domains. The<unk>  precursor protein is first processed by the removal of 4 Arginine residues, forming two chains, beta and alpha, linked by a disulfide bond. The<unk>  convertase activates<unk>  by cleaving the alpha chain, releasing<unk> a anaphylatoxin and generating<unk> b (beta chain + alpha' (alpha prime) chain).
Complement component 3
Complement component 4
Complement component 5a
Complement receptor 1
Major basic protein
Neutrophil elastase
Macrophage-activating factor
Immunophilins