+C3c is a key fragment produced when [Complement C3](/wiki/Complement_C3), a central protein of the [complement system](/wiki/Complement_System), is cleaved. Its presence indicates active complement cascade, signaling an ongoing immune response within the body.
+## See also
+- [C3](/wiki/C3)
+- [Complement](/wiki/Complement)
+- [Immune System](/wiki/Immune_System)
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