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Clonogenic survival of cells treated with thymoquinone (TQ) alone and in combination with radiation. The cells were treated with TQ (SCC25 with 0, 10 or 20 µM; and CAL27 with 0, 5 or 10 µM) and then irradiated with 0, 2, 4, 6 or 8 Gy. Surviving colonies were counted after 10 days and expressed as the surviving fraction.
