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NK cell cytokine secretion during pregnancy is repressed. NK cells were freshly isolated by negative selection and cultured without stimulation (a) or with IL-12/IL-15 stimulation for 20 h (b). Supernatants were assayed by multiplex ELISA. Data is represented as the mean of all patients. All p values are compared to 6 months post partum. *p < 0.05, **p < 0.005, ***p < 0.001
