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Headspace Gas Chromatography of saliva samples. The figure shows the overlapped VOC profile of β-glucosidase treated saliva sample (black trace) and control saliva sample (red trace) from one volunteer. The zoomed in region presents several VOC peaks in the treated sample, which are absent in the control sample. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
