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The salivary levels of active collagenase matrix metalloproteinases‐8 (aMMP‐8) in subjects with or without periodontitis and HLA‐A11. The box plot represents mean, first and third quartiles, and maximum and minimum values, with the exceptions of outliers (circles: third quartile +1.5*interquartile range); *correspond to p < 0.05 and ***correspond to p < 0.001
