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Phosphorylation of MEK1 on threonine 286 in esophageal squamous epithelium from 2 representative patients with GERD with Barrett's esophagus and 2 representative patients with GERD without Barrett's esophagus. Note expression of the inhibitory form of phospho-MEK1 only in the patients with Barrett's esophagus. β-tubulin served as a loading control.
