Assertion: rat's skin | /r/CapableOf | lack neurotransmitter
Facets:
value: in their cutaneous sensory fibers
type: LOCATION
Source sentences:
text: Their skin lacks a neurotransmitter called "substance P" that is needed to send pain signals to the brain.
text: The skin of naked mole-rats lacks neurotransmitters in their cutaneous sensory fibers.