Dopamine receptors {DRD4 dopamine receptor} can be in brain. Perhaps, DRD4-gene allele {attention-deficit hyperactivity disorder, dopamine} arose 40,000 years ago and allowed bolder and more-curious personalities.
Biological Sciences>Zoology>Organ>Nerve>Neural Chemical>Receptor
4-Zoology-Organ-Nerve-Neural Chemical-Receptor
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Date Modified: 2022.0224