In biochemistry,<unk>  is an<unk>  which catalyzes the hydrolysis of the neurotransmitter acetylcholine into choline and acetic acid, a reaction necessary to allow a cholinergic neuron to return to its resting state after activation.
Cholinesterase enzyme
Vesicular monoamine transporter
Light-gated ion channel
Carrier protein
Neuron-Specific Enolase 
Voltage-gated proton channels
Motor protein
Ion transporter