+**C9a** is a specific [protein](/wiki/Protein) fragment, derived from a larger precursor molecule. It participates in various biological cascades, often impacting [cell signaling](/wiki/Cell_Signaling) and regulatory pathways within an organism.
+## See also
+- [Complement](/wiki/Complement)
+- [Immunity](/wiki/Immunity)
+- [Peptide](/wiki/Peptide)
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