Figure 4From: The new Rapid-i carrier is an effective system for human embryo vitrification at both the blastocyst and cleavage stageBlastocyst stage vitrification and re-expansion after warming. Human blastocysts vitrified with the Rapid-i. (a,b) Morphology immediately after warming, (c,d) Morphology two hours later. Both blastocysts now fully expanded and hatching out from the opening in the zona created after warming. Transfer resulted in a singleton pregnancy. Magnification 300 ×.Back to article page