For conception to occur, one sperm must fertilize the mature egg while in the fallopian tube. A sign that fertilization has occurred is when the egg begins to cleave, or divide, into multiple cells forming a blastocyst. The blastocyst then travels down the fallopian tube and enters the uterus. Implantation of the blastocyst must occur within the lining of the uterus for the further development of an embryo.
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