Assertion: periosteum's structure | /r/HasProperty | placenta
Facets:
Source sentences:
text: The structures are yolk sac, allantois, amnion, chorion, decidua, and placenta.
text: The structures are yolk sac, allantois, amnion, chorion, decidua, and placenta.
text: The structures are yolk sac, allantois, amnion, chorion, decidua, and placenta.