Assertion: fin whale's plate | /r/MadeOf | fingernail-like material
Facets:
Source sentences:
text: These plates consist of a fingernail-like material called keratin that frays out into fine hairs on the ends inside the mouth near the tongue.
text: These plates consist of a fingernail-like material called keratin that frays out into fine hairs on the ends inside the mouth near the tongue.