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The impact of storage on the performance of the IL-6 VFA. (A) IL-6 VFA tests stored at room temperature for one day, two weeks, four weeks, and six weeks were tested to detect varying doses of rIL-6 spiked into buffer using VFAs with Amersham 0.2 µm membrane in two layers. The correlation of rIL-6 levels to the imaging intensity (IS score) of the VFA tests under different storage durations is plotted in (B).
