| Health / Medical Topics |
C5a
Smaller fragment formed when C5 convertase splits C5 into C5a and C5b. C5a is a 74-amino acid peptide that includes a carboxy-terminal arginine crucial for its spasmogenic activity and a carbohydrate moiety. Initiates the spontaneous assembly of the late complement components, C5-C9, into the membrane attack complex. C5a is the most potent anaphylatoxin, mediating immediate hypersensitivity. C5a is also chemotactic for neutrophils and monocytes. (NCI Thesaurus)
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