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  • noun

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an antibody that causes precipitation when it unites with its antigen

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Precipitin tests on smears of gut contents of possible predators showed that Coleoptera larvae, Hemiptera and predacious adult Dipterans were important predators.
Preinoculation serum was collected from each bird to confirm they were serologically naive to influenza A viral antigens by agar gel precipitin test (AGP) and to H5 influenza by specific hemagglutination inhibition (HI) testing by using standard procedures (11).
As the 1980s approached, the precipitin test was being replaced by the enzyme linked immunosorbent assay (ELISA), but in this intervening period, researchers were also experimenting with radioactive isotopes.
The original test was a simple precipitin test, usually in a microcapillary tube, in which the height of the precipitant defined the amount of CRP present.