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The primary structure of the porcine complement-derived peptide, des-Arg omega-C5a, has been analysed. Des-Arg omega-C5a is the natural secondary product of the activation fragment of the fifth component of complement, C5a, and represents a classical anaphylatoxin. The elaborated amino-acid sequence confirms the structure of porcine C5a proposed earlier by Gerard and Hugli, with one exception. Further, by end-group determination and sequencing of the unreduced core of des-Arg omega-C5a the position of its three disulfide bridges has been determined, now allowing insight into the tertiary structure of des-Arg omega-C5a.

Amino-Acid Sequence and Disulfide Linkages of the Anaphylatoxin, Des-Arg ω -C5a, from Porcine Serum