Thymocytes were isolated following the procedure described previously3 (link). Irradiation was conducted about 1 h after cell culture in vitro. At 24 h after irradiation, thymocytes were collected, washed using PBS supplemented with Ca2+ and Mg2+, and then stained with a FITC-conjugated annexin V (BD Pharmigen) and propidium iodide (5 μg/ml, Sigma-Aldrich). Data were collected from at least 20,000 cells by FACSCanto (BD Pharmingen) and analyzed by Flowjo (Tree Star, Inc) without knowledge of the genotype or treatment by a single observer (C-LL).
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