Assertion: blastocoel | /r/CapableOf | exist inside the morula
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Source sentences:
text: The newly formed morula itself begins to change, as the cells that comprise its trophoblast secrete a fluid which, because of the tight junctions between the trophoblastic cells on the morula's external wall, remains inside the morula, causing by this "cavitation" a fluid-filled cavity called the " blastocoel " to exist inside the morula.