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. 1998 Sep 7;142(5):1371–1379. doi: 10.1083/jcb.142.5.1371

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Inhibition of ZAP-70 kinase activity by piceatannol. (a) Phosphorylation of the ZAP-70 substrate Sam68 in the presence of increasing concentrations of piceatannol. N, negative control (no ZAP-70 added). Equal loading of the gel is indicated by Coomassie blue staining of Sam68. (b) Quantification of kinase activity by phosphoimaging. Data shown are percentages of Sam68 phosphorylation in the absence of piceatannol and are averages of two independent experiments.