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Involved in muscle movement and cognitive processes related to learning and memory.

Important for regulating mood, appetite, and sleep. Also involved in cognition, reward, learning, and memory.

Key in the 'fight or flight' response and plays a role in the intellectual assessment of potential threats.

A major excitatory neurotransmitter involved in learning, memory, and neural processing.

Main inhibitory neurotransmitter in the brain; facilitates calmness and relaxation.

Involved in reward, motivation, and addiction; plays a key role in attention and executive functions.

Neurotransmitter that plays a role in mood and stress responses and also in the formation of new memories.

Considered both a neurotransmitter and a hormone; plays a role in mood regulation, emotional bonding, and appetite.

Implicated in pain perception, natural analgesia, and reward mechanisms.

Modulates the immune response and affects learning and memory processes.

Neurotransmitter that can have neuroprotective properties and is linked to appetite regulation.

Plays a vital role in the regulation of emotions and pain, as well as cognitive and neuroendocrine functions.

Helps to regulate pain, but in the form of peptides called enkephalins.

Contributes to mood regulation, pain perception, and the stress response.