+**C2b** is a fragment derived from [Complement C2](/wiki/Complement_C2), a key protein in the immune system. It acts as a serpin, regulating processes within the body's [Immune Response](/wiki/Immune_Response). While known for its role in the complement cascade, C2b also participates in other crucial biological functions.
+## See also
+- [Complement System](/wiki/Complement_System)
+- [Serpin](/wiki/Serpin)
+- [C3 Convertase](/wiki/C3_Convertase)
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