Additional file 3.

Control of stability of gradients. Stability of 14 linear gradients was proved with a refractometer. Gradient fractions were collected from top of gradient and percentage of sucrose content was measured. Standard deviations are shown by error bars.

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Fromm-Dornieden et al. BMC Molecular Biology 2012 13:9   doi:10.1186/1471-2199-13-9