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Annual review of immunology 27 , 229265, doi: 10.1146/annurev.immunol.021908.132715 (2009)

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Specifically, they observed elevations in: Acetylcholine: Critical for memory formation and cognitive processing Dopamine: Essential for motivation, focus, and reward GABA: The brain's primary inhibitory neurotransmitter These changes in neurotransmitter levels were consistent across both young and aged animals, though young animals generally exhibited higher baseline levels of all neurotransmitters compared to their older counterparts

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