Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A protein in blood serum that participates in the body's immune response by working in conjunction with the alternative pathway of the complement system.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun biochemistry A protein in human serum that complements part of the immune system

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Probably pro– + Latin perdere, to destroy; see perdition + –in.]

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Examples

  • The activation through the classical pathway requires C1q, the alternative pathway requires C3b, properdin, and serum factors B and D; and the lectin pathway requires binding carbohyrdate residues on the surface of the bacteria similar to C1q.

    Confirmation Bias and ID 2006

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