opsonin

Noun
  1. An antibody in blood serum that attaches to invading microorganisms and other antigens to make them more susceptible to the action of phagocytes (synset 115054831)
    is a type of: antibody - any of a large variety of proteins normally present in the body or produced in response to an antigen which it neutralizes, thus producing an immune response
    substance meronym: blood serum, serum - an amber, watery fluid, rich in proteins, that separates out when blood coagulates

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