It inhibits the action of C4, more specifically the classical and the lectin pathways.
Component Object Model | complement | Two-component regulatory system | component | lamp (electrical component) | Distributed Component Object Model | Component video | Service Component Architecture | Belgian Land Component | Windows Imaging Component | Unknown Component | Schur complement method | One's complement | independent component analysis | Connected-component labeling | connected component (graph theory) | component video | Component Pascal | Component-based software engineering | Component-based software engineering | Complement System | Complement system | complement system | complement (or negative) | Complement (order theory) | Complement membrane attack complex | Complement component 4 | Complement (complexity) | Complement | Book Item and Component Identifier |