A group of clustered compounds (bottom of the heatmap) include metabolites (some of them belonging to monoterpene class) showing, in general, a decreasing trend in wine samples obtained from refrigerated grapes.
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Pre-processing Cooling of Harvested Grapes Induces Changes in Berry Composition and Metabolism, and Affects Quality and Aroma Traits of the Resulting Wine.
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The sentences
The clustering algorithm grouped together 3 terpenes (cadinene, cubebene and gurjunene) and 2-heptanone, all showing an increasing trend compared to T0.