properdin

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pro·per·din

 (prō-pûr′dn)
n.
A protein in blood serum that is a component of the innate immune system, acting as a positive regulator of the alternative pathway of the complement system.

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

properdin

(ˈprəʊpədɪn)
n
(Medicine) immunol a protein present in blood serum that, acting with complement, is involved in the destruction of alien cells, such as bacteria
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