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Levels of proinflammatory cytokines (pg/mL) on day 6 of pregnancy in endometrial explants of “donor” sows infused with 40 mL of SP, TGF-β1 in BTS extender (TGF-β1), or BTS alone (control) 30 min prior to insemination. The box plots show the median (line) and the interquartile ranges (boxes, Q1–Q3). * p < 0.05, ** p < 0.01, *** p < 0.001.
