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CDX2 mRNA expression in biopsy specimens of esophageal squamous mucosa from GERD patients with and without Barrett’s esophagus. CaCo2 cells served as a positive control. M, marker; C, control; B, esophageal squamous biopsy from a GERD patient with Barrett’s esophagus; G, esophageal squamous biopsy from a GERD patient without Barrett’s esophagus
