Assertion: fish's scale | /r/MadeOf | keratin
Facets:
Source sentences:
text: Made of keratin, the scales of the pangolin are sturdy enough to resist a lion’s bite.
text: The scales are made of keratin; the same material out of which our fingernails are made.
text: A pangolin’s body is covered with scales made of keratin — the same substance that your fingernails are made of.