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Effects of compounds 17, 18, 20 and 35 on colony formation. (A) Photos of A375 and HT-29 colonies at the end of the experiment. (B) Numbers of colonies at the end of the experiment. (C) Areas of colonies at the end of the experiment. Single asterisks (*) indicate p < 0.05 and pairs (**) indicate p < 0.01 compared to the control (untreated cell colonies).
