CHAT (Choline Acetyltransferase): CHAT is the enzyme responsible for synthesizing acetylcholine, a critical neurotransmitter in both the peripheral and central nervous systems. Acetylcholine is involved in a wide range of functions, including muscle contraction, heart rate, memory, and learning. Dysfunctions in acetylcholine synthesis, due to alterations in CHAT activity, are associated with neurological disorders such as Alzheimer's disease and myasthenia gravis....