| NOUN | substance | opsonin | an antibody in blood serum that attaches to invading microorganisms and other antigens to make them more susceptible to the action of phagocytes |
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| Meaning | An antibody in blood serum that attaches to invading microorganisms and other antigens to make them more susceptible to the action of phagocytes. | |
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| Broader | 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 of | serum, blood serum | An amber, watery fluid, rich in proteins, that separates out when blood coagulates |
| Spanish | opsonina | |
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