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. 2014 Jun 20;4(2):499–516. doi: 10.3390/metabo4020499

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© 2014 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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(a) Comparison of the absolute concentration values from GC/QqQ-MS and LC/QqQ-MS systems. The bar graphs represent the mean values of triplicate samples and error bars indicate the standard deviations. These metabolites were successfully detected by both systems and resulted in similar values of absolute concentration; (b) Comparison of the metabolic profiles of the three cyanobacterial strains, namely, PCC7002, PCC7942 and PCC6803 under photoautotrophic conditions. Z-scored data were hierarchically clustered and the results are represented with a heat map.