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Porcine embryos, which had been vitrified and stored in liquid nitrogen for up to three yr, were retrospectively analyzed to evaluate the influence of duration of storage on their in vitro viability post-warming. All embryos were vitrified (OPS or SOPS) and warmed (three-step or direct warming) using procedures that resulted in the same in vitro survival, hatching rates, and numbers of cells. Therefore,...
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