Assertion: echidna's spine | /r/MadeOf | keratin
Facets:
value: mostly
type: DEGREE
Source sentences:
text: Spines are made of keratin which is the same substance that builds human hair and nails.
text: The spines, which may be up to 50 mm (2 in) long, are modified hairs, mostly made of keratin.
text: Did you know that the spines on an echidna are made of keratin?
text: The spines of echidnas are actually modified hair made of keratin.
text: The spines, which may be up to 50 mm long, are modified hairs, mostly made of keratin.