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I am reading an article (http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3596711/) wherein a TOPflash/FOPflash assay is used to detect beta-catenin protein levels in a COS-7 cell line. I can't find a good explanation in the article, or in any other article, as to how this assay works. I understand the cells are transfected with TOPflash/FOPflash reporter plasmids, but that's about it. Any insight or redirection would be much appreciated.

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