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11 / 12  In the Ouchterlony assay, we see a sharp precipitin arc form between antigen and antiserum. Why does this arc remain visible for a long time?
A  The antibody molecules are too large to diffuse through the agar.
B  The precipitin lattice is too large to diffuse through the agar.
C  Methanol, added once the arc forms, denatures the protein and blocks diffusion.
D  The antigen molecules are chemically coupled to the gel matrix.

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Source:  OpenStax, Microbiology. OpenStax CNX. Nov 01, 2016 Download for free at http://cnx.org/content/col12087/1.4
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