The presence of D1R-D2R heterodimers is increased in the globus pallidus of schizophrenia patients and seems to be responsible for promoting grooming behavior and α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor (AMPAR)’s GluR1 phosphorylation [177,178]. Here, DRD2 is linked to schizophrenia.