Assertion: bear's gene | /r/HasSubevent | the absence
Facets:
value: possibly
type: DEGREE
value: on this pigment
type: LOCATION
value: in their fur
type: LOCATION
Source sentences:
text: Two genes that are known to influence melanin production, LYST and AIM1, are both mutated in polar bears, possibly leading to the absence on this pigment in their fur.