Fig. 1From: Saliva DNA quality and genotyping efficiency in a predominantly elderly populationExamples of saliva DNAs having visible impurities. Sample S-2922 has a normal clear appearance, similar to DNAs extracted from blood. The others have various degrees of turbidity and/or brownish/reddish discoloration. Brownish saliva DNAs, S-3053 and S-1829, may have come from specimens contaminated by tobacco, food dyes or lipstickBack to article page