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. 2008 Nov 6;1:7. doi: 10.1186/1757-2215-1-7

Figure 1.

Figure 1

Schematic for prophylactic embryo cryopreservation at the 2pn stage, followed by extended culture to blastocyst stage (B) and subsequent transfer (ET). Non-transferred blastocysts are re-frozen for subsequent use (lower left).