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Figure 1 | BMC Biology

Figure 1

From: 'Systems toxicology' approach identifies coordinated metabolic responses to copper in a terrestrial non-model invertebrate, the earthworm Lumbricus rubellus

Figure 1

Hierarchical cluster analysis of samples according to fitted metabolite concentrations (scaled to unit variance). Samples 40_1r1 to 40_1r5 represent five instrument replicates, demonstrating that neither the machine variation nor the peak fitting procedure introduce significant amounts of error compared with the within-group biological variation.

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