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Gross appearance of the beaver gestation sac and placenta. Uterus with single sac (A) or triplets (B). Gestation sac with: riven yolk sac (C) or removed fetus (D). External view of the placenta with quads demonstrating regions harvested for: (1) IHC and Western; (2) IHC and RNA isolation (E). Abbreviations: U—uterus; F—fetus; YS—yolk sac; Am—amnion; L—labyrinth; Sp—subplacenta.
