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Selected metabolites that were affected by both prolonged blood incubation and extended serum storage. (a–e) Boxplots of metabolite levels that were significantly changed by both prolonged blood incubation and extended serum storage; In (a), the term “add.” (additional) means that quantification could be influenced by minor levels of other metabolites with identical analytical characteristics with respect to the quantitation method; (f) Legend for the boxplots in (a–e).
