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* Zona pellucida ruptures with the development of a small fissure just large enough for the blastocyst to squeeze out.
 
* Zona pellucida ruptures with the development of a small fissure just large enough for the blastocyst to squeeze out.
 
* Blastocyst ''''hatches'''' from the zona pellucida.
 
* Blastocyst ''''hatches'''' from the zona pellucida.
** '''Rodent,Dog,Cat,Primate''': 8 days after fertilization
+
** '''Rodent, Dog, Cat, Primate''': 8 days after fertilization
 
** '''Ungulates''': 12 days after fertilization.
 
** '''Ungulates''': 12 days after fertilization.
 
* Blastocyst free-floating within the Uterus, totally dependent on the uterine environment for survival.
 
* Blastocyst free-floating within the Uterus, totally dependent on the uterine environment for survival.
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