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5-8F-IR cells with radioresistance derived from irradiated 5-8F cells. (A-1) Only 5% of the cells survived following irradiation of 5-8F cells with 10 Gy X-ray after 5 days (A-2) Fifteen days later a large subclone was selected, and named for 5-8F-IR (black arrow). (B and C) The subclone 5-8F-IR irradiated with 6 Gy (a medium dosage) X-ray was more resistant than the parent 5-8F.
