A non-noradrenergic, non-cholinergic transmitter (NANC) is a neurotransmitter of the autonomic nervous system (ANS) that is neither acetylcholine, norepinephrine, nor epinephrine. A non-noradrenergic, non-cholinergic transmitter (NANC) is a neurotransmitter of the autonomic nervous system (ANS) that is neither acetylcholine, norepinephrine, nor epinephrine.