+**C6b** is a fragment of [C6](/wiki/c6), a protein component of the innate immune system. It plays a critical role in the formation of the [Membrane Attack Complex](/wiki/mac), contributing to the immune system's ability to destroy pathogens.
+## See also
+- [Complement System](/wiki/complement_system)
+- [C6](/wiki/c6)
+- [Membrane Attack Complex](/wiki/mac)
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