Assertion: umbilical cord | /r/MadeOf | remnants of the yolk sac
Facets:
Source sentences:
text: The umbilical cord develops from and contains remnants of the yolk sac and allantois (and is therefore derived from the same zygote as the fetus).
text: The umbilical cord develops from and contains remnants of the yolk sac and allantois (and is therefore derived from the same zygote as the fetus).
text: The umbilical cord develops from and contains remnants of the yolk sac and allantois (and is therefore derived from the zygote).