Assertion: umbilical cord's allantois | /r/HasProperty | compressed to slender cord
Facets:
Source sentences:
text: Between days 28 and 40 p. c., the expanding amnionic cavity has surrounded the embryo so far that the connecting stalk, the allantois, and the yolk sac are compressed to a slender cord, which is then covered by amnionic epithelium (Fig.