FIGURE 1. Metabolite data.

From the following article:

The science of doping

Donald A. Berry

Nature 454, 692-693(7 August 2008)

doi:10.1038/454692a

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Plots show the distribution of 167 samples of the metabolites etiocholanone and 5 beta-androstanediol (a, b), and androsterone and 5 alpha-androstanediol (c, d). Panels b and d show samples the French national anti-doping laboratory (LNDD) designate to be 'positive' (red crosses) or 'negative' (green dots); the values from Landis's second sample from stage 17 is shown as a blue dot. Axes display delta notation, expressing isotopic composition of a sample relative to a reference compound.

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