The human thyroid cells employed consisted of papillary carcinoma (TPC-1, KTC-1; radiation-sensitive), follicular carcinoma (WRO) and anaplastic carcinoma (FRO and KTC-2; radiation-resistant) cells [9 (link)]. Table 1 shows the characteristics of the cell lines. Cells were cultured in Dulbecco’s modified Eagle’s medium (high-glucose) and nutrient mixture F-12 HAM (Fujifilm Wako Pure Chemical, Doshomachi, Osaka, Japan) (1:1) supplemented with 5% fetal bovine serum (FBS; Equitech-Bio, Inc. Kerrville, TX, USA) in humidified 5% CO2 at 37°C.
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