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Use of the Cytosponge. (A) Cytosponge embedded in a gelatin capsule. (B) The Cytosponge is swallowed and descends to the stomach through the esophagus. (C) The expanded Cytosponge. (D) The Cytosponge is retrieved by an assistant who pulls the string. (E) Immunohistochemical analysis of TTF3 in cells collected by the Cytosponge as well as BE cells (arrows).
