Luminex phosphorylation measurements are reproducible and have broad dynamic range Individual difference in insulin‐induced phosphorylation of ERK measured.

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Luminex phosphorylation measurements are reproducible and have broad dynamic range Individual difference in insulin‐induced phosphorylation of ERK measured by Luminex assay is validated by Western blot. Luminex phosphorylation measurements are reproducible and have broad dynamic range Individual difference in insulin‐induced phosphorylation of ERK measured by Luminex assay is validated by Western blot. Skin fibroblasts from the indicated 3 individuals were treated with 100 nM insulin in duplicates. Cells were harvested and assayed using Luminex phosphorylation assay or Western blot using the same antibodies. Cells were treated with 100 nM IGF1 as a positive control. Total protein levels of AKT or ERK did not change before and after insulin treatment.Compared to differences in phosphorylation levels, total protein levels are not as variable across individuals. Total protein levels or insulin‐induced phosphorylation levels of 7 signaling factors shown in Fig 5A were measured in 20 individuals by Luminex assay. Average value of biological duplicates is shown.Fluctuation in total protein levels does not contribute to variation in phosphorylation levels induced by insulin. The same data as in (B) were re‐plotted to show there is no correlation between phosphorylation levels and total protein levels. Source data are available online for this figure. Isabel Xiaorong Wang et al. Mol Syst Biol 2015;11:820 © as stated in the article, figure or figure legend