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Substance Name: Complement C4a
RN: 80295-49-4


  • The smaller fragment formed when complement C4 is cleaved by COMPLEMENT C1S. It is an anaphylatoxin that causes symptoms of immediate hypersensitivity (HYPERSENSITIVITY, IMMEDIATE) but its activity is weaker than that of COMPLEMENT C3A or COMPLEMENT C5A.

Molecular Formula

  • Unspecified

Classification Code

  • Immunologic Factors
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Names and Synonyms

MeSH Heading

  • Complement C4a

Systematic Name

  • Complement C4a

Registry Numbers

CAS Registry Number

  • 80295-49-4

System Generated Number

  • 0080295494