Assertion: brain's area | /r/CapableOf | call the substantia
Facets:
Source sentences:
text: Neurons containing the neurotransmitter dopamine are clustered in the midbrain in an area called the substantia nigra.
text: Parkinson's disease, a degenerative condition causing tremor and motor impairment, is caused by a loss of dopamine-secreting neurons in an area of the midbrain called the substantia nigra.