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Localization of EDN1, ECE1, EDNRA and EDNRB mRNA in the canine utero-placental (Ut/Pl) units during prepartum luteolysis as determined by in situ Hybridization (ISH). All factors are localized in trophoblast cells (open arrows; A–D). There is no background staining in the negative controls (insert to A–D).
