CD4 and Barrett esophagus: Expanded lymphocytes from these tissues had a similar phenotype, characterized by a comparable but low percentage of αE(CD103) positive CD4+cells (44±5% in BE, 43±4% in duodenum of BE and 34±7% in duodenum of controls) and a similar percentage of granzyme-B+CD8+ cells(44±5% in BE, 33±6% in duodenum of BE and 36±7% in duodenum of controls).