| PMA | index of prevalence and severity of gingivitis, where P = papillary gingiva, M = marginal gingiva, a... |
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| phosphomolybdic acid |
a strong acid and oxidizing agent used as a protein precipitant and color reagent; alkaloids, xanthine, uric acid, and other substances reduce phosphomolybdic acid to molybdenum blue. It is also used in histology as a mordant.
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