Additional file 8.

Schematic diagram of the online metal-free RPLC/WCX-HILIC system. Details of the experimental set-up used to perform the described HPLC separations, including valve and flow path details. HPLC, high performance liquid chromatography; RPLC/WCX-HILIC, reversed phase liquid chromatography-weak cation exchange-hydrophilic interaction liquid chromatography.

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Tian et al. Genome Biology 2012 13:R86   doi:10.1186/gb-2012-13-10-r86