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The amount (A) and the concentration (B) of IL-1β in GCF in healthy and periodontitis sites between subjects with IL-1B(3954)-SNP positive and IL-1B(3954)-SNP negative. Statistical significant differences were found between IL-1β amount (P < 0.001) and IL-1β concentration (P < 0.001) in GCF in periodontitis sites between IL-1B(3954)-SNP positive and IL-1B(3954)-SNP negative subjects
