is blastocyst necessary for ivf ?

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Is blastocyst necessary for IVF?
A blastocyst forms about five to six days after a sperm fertilizes an egg. Layers of cells in the blastocyst divide and separate. They eventually become the structures that protect and nourish the developing fetus. The blastocyst stage of a fertilized egg is especially important for in vitro fertilization (IVF).Apr 29, 2022