Fig. 2From: Impact of aging on TREM-1 responses in the periodontium: a cross-sectional study in an elderly populationThe inflammatory characteristics of the GCF samples from elderly patients with or without periodontal disease. GCF volume (a) was measured using a calibrated Periotron 8000, and then the readings were converted to an actual volume (μL) by reference to the standard curve. GCF total protein concentrations (b) were measured with a fluorometric assay. Horizontal lines show median valuesBack to article page