+C5 frequently represents a chain of five [Carbon](/wiki/Carbon) atoms, a foundational building block in organic chemistry. It also signifies the fifth component within the biological [Complement](/wiki/Complement) system, essential for immune function.
+## See also
+- [Organic Chemistry](/wiki/Organic_Chemistry)
+- [Immune System](/wiki/Immune_System)
+- [Pentane](/wiki/Pentane)
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