What were the receptors at the autonomic ganglia known as prior to the discovery of the neurotransmitter acetylcholine (ACH)?

Name: What were the receptors at the autonomic ganglia known as prior to the discovery of the neurotransmitter acetylcholine (ACH)?
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Before the discovery of ACH, nicotine was found to stimulate the autonomic ganglia. Hence, the receptors at the ganglia were known as nicotinic receptors. Currently, they are more specifically classified as the nicotinic-neural (Nn) receptors.

What Were the Receptors at the Autonomic Ganglia Known as Prior