Figure 2. The post-warming embryos at blastocyst stage. A. Blastocysts at 48 h after warming, magnification: ×50. B. Blastocysts at 72 h after warming, magnification: ×50. An arrow indicates a blastocyst which is hatching from zona pellucida C. Blastocysts at 72 h after warming, magnification: ×200. An arrow indicates a blastocyst which hatched from the zona pellucida.