They found the differences in the gene for a molecule called the dopamine D2 receptor (DRD2), a protein present on brain cells that are sensitive to the neurotransmitter dopamine.

• 他们发现了一个称为多巴胺D2受体（DRD2）的分子的基因差异，DRD2受体是人脑细胞上对神经递质多巴胺敏感的一种蛋白质。