While many of these conditions are poorly understood, neurotransmitter dysfunction is thought to play a central role. Acetylcholine deficiency, for example, may play a role in Alzheimer's disease ...

There are two types of removal: Re-uptake – the neurotransmitter is reabsorbed back into the presynaptic neuron and restored inside a vesicle ready to be used again. For example, noradrenaline.

For example, the strength of synaptic connections ... the creation of an optical probe they call a fluorescent false neurotransmitter (or FFN) and used it to look at activity changes in individual ...