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* The central event in complement activation is the hydrolysis of the major complement protein, C3.
 
* The central event in complement activation is the hydrolysis of the major complement protein, C3.
 
** C3 is a large 2-chain molecule.
 
** C3 is a large 2-chain molecule.
** Hydrolysis results in the removal of a small peptide, C3a.
+
** Hydrolysis results in the removal of a small peptide, C3a (which itself is pro-inflammatory).
 
*** This leaves C3b.
 
*** This leaves C3b.
 
**** C3b is highly reactive but very short-lived.
 
**** C3b is highly reactive but very short-lived.
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