OLIG2 and Barrett esophagus: In BE mice, Nestin+/+ cells was about one third (34.0 ± 8.5%) of the BrdU+Olig2+ doublets with their cell density being 0.67 ± 0.19 cells/106 μm3, and another third of them (36.3 ± 5.8%) was Nestin-/- with their cell density being 0.64 ± 0.08 cells/106 μm3.