Assertion: acetylcholine's effect | /r/CreatedBy | the m 1 receptor
Facets:
value: previously
type: TEMPORAL
Source sentences:
text: This effect was also attributed to the M 1 receptor, since it was blocked by pirenzepine, a M 1 receptor-preferring antagonist26.
text: Another explanation was that other muscarinic receptor subtypes might have been responsible for the neuroprotective effects that had previously been attributed to the M 1 receptor.