here in a Turkish study (polymorphic?), essential tremor was associated with lower expression of DRD3 mrna. This would be consistent with non A trait genetics since more sensitive receptors would instigate negative feedback to lower production of DRD3 receptors. Interestingly, after treatment with propanolol (epinephrine blockage) the mrna of DRD3 was still low. So the authors concluded that low mrna DRD3 is a genetic feature of benign essential tremor. This is what we have concluded under guidance of NPA theory.
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