Assertion: sloth's vertebra | /r/HasProperty | due
Facets:
value: to mutations in the homeotic genes
type: CAUSE
Source sentences:
text: Three-toed sloths are unusual amongst the mammals in possessing as many as nine cervical vertebrae, which may be due to mutations in the homeotic genes.
text: Two-toed sloths are unusual among mammals in possessing as few as five cervical vertebrae, which may be due to mutations in the homeotic genes.