Assertion: carapace | /r/MadeOf | bone
Facets:
value: with a thin layer of epithelium
type: OTHER
Source sentences:
text: The shell is made of bone covered by living vascularized tissue and covered with a layer of keratin.
text: Rather the shell is part of the turtle’s body and is made of bones, collagen, skin, and keratin.
text: The shell is made of bones with a thin layer of epithelium.