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. 2013 Apr 17;8(4):e61745. doi: 10.1371/journal.pone.0061745

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© 2013 Rozsypal et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Principal component analysis showing the association between sampling date (red circles) and the concentration of 52 different metabolites (eigenvectors) in the hemolymph of field-sampled caterpillars of Cydia pomonella during 2010/2011. The numbers coding for metabolites are decoded in Dataset S1. The eigenvectors of alanine (6), fructose (44), and mannitol (46) extend beyond the circle delimiting 90% fit of the model. The metabolites (42–47) most characteristic for winter (January) sample are enclosed by a dashed line ellipse.