+**C3f** is a small, biologically inert fragment released from [Complement C3](/wiki/complement_c3) during the intricate activation of the complement cascade. Its presence often signifies the cleavage of C3b by [Factor I](/wiki/factor_i), acting as a byproduct rather than a direct effector in the primary immune defense.
+## See also
+- [Complement System](/wiki/complement_system)
+- [C3b](/wiki/c3b)
+- [Proteolysis](/wiki/proteolysis)
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