Pattern of γ-radiation sensitivity by clonogenic assays. 104 untransfected MM3MG and cells overexpressing TLK1B were irradiated with the indicated doses and plated in triplicates of 100, 500, 1000, or 5000 cells in multiwell plates. The colonies were counted 10 days later. The average from 2 independent experiments is shown. S.F. = surviving fraction.