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. Author manuscript; available in PMC: 2014 Jul 15.
Published in final edited form as: Cancer Res. 2013 May 7;73(14):4418–4428. doi: 10.1158/0008-5472.CAN-12-4640

Figure 1.

Figure 1

The percentage of surviving RKO36 human colon carcinoma cells grown to confluence as a function of the timing of very low radiation doses of 5, 10, 20 and 100 mGy, administered 30 min or 6 h following the first of two 2 Gy doses separated by 24 h, are presented. P values were determined by comparing the survival of cells following two 2 Gy doses with those exposed to two 2 Gy doses along with the various very low mGy doses using a two-tailed Student’s t test with values ≤ 0.05 identified as significant. Each experiment was repeated 3x and error bars represent the standard error of the mean (SEM).