+C2a is a vital fragment of the [C2 protein](/wiki/c2_protein), playing a critical role within the body's elaborate [complement system](/wiki/complement_system). This small, active component contributes to inflammation and helps orchestrate the innate immune response, defending against pathogens.
+## See also
+- [Complement System](/wiki/complement_system)
+- [C3 Convertase](/wiki/c3_convertase)
+- [Immunity](/wiki/immunity)
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