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. 2014 Oct 30;4:6802. doi: 10.1038/srep06802

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(A) propionylcholine, (B) succinic acid, (C) lactic acid, (D) acetylphenylalanine, (E) carnitine, (F) phytosphingosine. Horizontal lines represent from bottom to top: the minimum, 25^th, 50^th, and 75^th percentiles and the maximum.