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Differences in endometrial proinflammatory cytokine levels six days after the onset of estrus between blastocyst-bearing (BB) and uninseminated cyclic (U-IC) sows. Data are presented as box plots showing the median and interquartile range (Q1–Q3). BDL: values below the detection limits for the assay. Asterisks indicate significant differences between groups (* p < 0.05; ** p < 0.01; *** p < 0.001).
