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complement component
This term is a highly specialized technical expression used exclusively within immunology and biochemistry. It refers to the specific proteins that facilitate the "complement" process, where the immune system complements the action of antibodies to destroy pathogens. It is never used in a general or metaphorical sense to describe things that complete or go well together.
Because it describes a specific class of proteins, it is treated as a countable noun. In scientific literature, it is frequently paired with alphanumeric designations (e.g., C3, C4, C5) to specify which particular protein in the cascade is being discussed.
Meanings
Any of the proteins or protein fragments that make up the complement system, a part of the immune system that enhances the ability of antibodies and phagocytic cells to clear microbes and damaged cells from an organism.
The C3 complement component plays a central role in the activation of the complement cascade.