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(A) Phase contrast images and (B) basal surviving fraction of 3D grown colonies of BEMER treated (~13 μT, 8 min, 1 h, 24 h) and BEMER sham-treated (sham) cancer cell lines. (C) Flow chart of colony formation assay. (D) Clonogenic cell survival after BEMER therapy (~13 μT, 8 min, 1 h, 24 h) combined with radiotherapy (2 and 6 Gy). All results represent mean ± SD. Student's t-test. n = 3. * P < 0.05; ** P < 0.01.
