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Effect of human insulin (10 and 100 nM) and insulin receptor antagonist S961 (1 and 10 nM) on proliferation of MCF-7 (A), MDA-MB-231 (B) and T47D (C) cells measured by MTT assay. All data are represented as means±standard deviation, n=3. P *≤0.05, **≤0.01 and ***≤0.001 vs control.
