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Monoamines are a class of neurotransmitters that are derived from amino acids and contain a single amine group. They play a crucial role in regulating various physiological functions in the central nervous system, including mood, behavior, and cognition. Some common monoamines include dopamine, serotonin, and norepinephrine. These neurotransmitters are involved in the modulation of emotions, sleep-wake cycles, and stress responses. Dysregulation of monoamine levels has been implicated in various psychiatric disorders, such as depression, anxiety, and schizophrenia.