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Human Blastocyst Hatching From Shell
Photomicrograph (microscopic view) of a human blastocyst that is hatching out of the zona pellucida (shell). The blastocyst generally hatches through a small defect (hole) that has been created in the embryo’s shell (zona pellucida) and then spontaneously restores its (original) shape. The blastocyst must undergo hatching (generally within the uterine cavity) in order to implant successfully into the uterus.
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