Results showed a significant increase in the number of CD56(+) natural killer (NK) cells and the percentages of CD3(-) CD56(+) CD16(-) NK cell subset in the tissue treated with mifepristone, while the percentage of CD3(-) CD56(+) CD16(+) NK cell subset remained unaffected. It shows that low-dose mifepristone increases the number of CD56(+) NK cells and the percentage of CD3(-) CD56(+) CD16(-) NK subset in receptive endometrium and provides new insights into the immunological mechanism of low-dose mifepristone as an anti-implantation contraceptive drug.
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