Assertion: narcolepsy's cause | /r/HasProperty | a lack of hypocretin
Facets:
value: usually
type: DEGREE
value: in the brain
type: LOCATION
Source sentences:
text: Cataplexy is a cardinal symptom as it almost always indicates that the cause of the narcolepsy is a lack of hypocretin in the brain.
text: When narcolepsy happens with a sudden muscle relaxation called cataplexy, the cause is usually a lack of hypocretin — a neurotransmitter responsible for sleep regulation.