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Cell viability of MCF-7 breast cancer cells incubated for 24, 48, and 72 h (a, b, and c panels, resp.) with free tamoxifen (Tamoxifen), tamoxifen-loaded nanoparticles (tamoxifen-NP), empty nanoparticles (NP), or DMSO. Each bar represents the mean of three samples ± SD.
