
Immunodiffusion is a diagnostic test which involves diffusion through a substance such as agar. Two commonly known forms are Ouchterlony double immunodiffusion and radial immunodiffusion. ...
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http://en.wikipedia.org/wiki/Immunodiffusion

<technique> The classical technique used to detect the presence of antibodies and determine their specificity by visualisation of precipitin lines. A technique for analysing antigen and antibody mixtures by watching them as they diffuse toward each other within a support medium (usually a gel). ... The precipitin lines (precipitated antigen-a...
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http://www.encyclo.co.uk/local/20973

(im″u-no-dĭ-fu´zhәn) the diffusion of antigen and antibody from separate reservoirs to form decreasing concentration gradients in hydrophilic gels.
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A serological procedure in which the antigen-antibody reaction is carried out be allowing the reactants to diffuse in gel.
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Type: Term Pronunciation: im′yū-nō-di-fyū′zhŭn, im-ū′nō- Definitions: 1. A technique to study antigen-antibody reactions by observing precipitates formed by antigen-antibody complexes, which are combinations of specific antigen and antibodies separately placed in a gel and diffused.
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http://www.medilexicon.com/medicaldictionary.php?t=43718

any of various analytical techniques that involve antigen and antibody solutions diffusing toward each other in a gel until antibody binds specifically to antigen to form a precipitate.
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https://www.infoplease.com/dictionary/immunodiffusion
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