nanonug
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From "Mast Cells for Dummies - Dopamine Regulator":
"One of the Mast cells functions is regulating dopamine by releasing the neuropeptide (organic brain chemical) neurotensin. Neurotensin has many effects, one of which is decreasing Dopamine. The mast cells can release more of less neurotensin to decrease or increase dopamine and a dysfunction of the mast cells will throw off dopamine levels. This can lead to a wide range of learning disabilities since the reward driven learning mechanism may either not be rewarding success (not enough dopamine) or rewarding unsuccessful action (too much dopamine)."
"One of the Mast cells functions is regulating dopamine by releasing the neuropeptide (organic brain chemical) neurotensin. Neurotensin has many effects, one of which is decreasing Dopamine. The mast cells can release more of less neurotensin to decrease or increase dopamine and a dysfunction of the mast cells will throw off dopamine levels. This can lead to a wide range of learning disabilities since the reward driven learning mechanism may either not be rewarding success (not enough dopamine) or rewarding unsuccessful action (too much dopamine)."