Complement component C3b
Complement component C3b is a crucial protein fragment generated during the activation of the complement system, an essential part of innate immunity. C3b plays a key role in opsonization, where it binds to the surface of pathogens, marking them for recognition and ingestion by phagocytic immune cells like macrophages and neutrophils. This process enhances the clearance of microbes and contributes significantly to immune defense mechanisms.
