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Nuclear morphological changes induced by different Se compounds in (A)MDA-MB-231 cancer cells, as well as (B)MCF-7 cells cultured with E2 for different time periods. DAPI staining shows apoptotic nuclei; human breast cancer cells were exposure to different Se compounds (1500 ng Se/ml); MSC=methyl- selenocysteine; MSA=methylseleninic acid.
