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properdin

/ ˈprəʊpədɪn /

noun

  1. immunol a protein present in blood serum that, acting with complement, is involved in the destruction of alien cells, such as bacteria
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


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proper adjectiveproper fraction