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(A) In situ localization of BERV-K3 transcript in day 22 pregnant animals. (B) In situ localization with the sense-strand probe (negative control). (C) Higher magnification showing luminal epithelia and elongated trophoblasts. (D) Higher magnification showing glandular epithelial regions. GE, glandular epithelia; LE, luminal epithelia; Tr, trophoblast.
