Assertion: main placenta | /r/HasProperty | small disc-like organ
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Source sentences:
text: it is made up by the chorioallantoic main placenta, a small disc-like organ (Figures 3a,b); at its basis the latter has a stem-like connection to the uterine wall, the placental stalk, which contains the subplacenta, representing a special segment of the chorioallantoic placenta (Figures 2, 3a,b).