5‐HTR, serotonergic receptor; DR, dopaminergic receptor; P, intraperitoneal injection; SC, subcutaneous injection; αR, adrenergic alpha receptor; βR, adrenergic beta receptor; Night blindness models with full knockouts of Arr1, Arrestin beta 1; Gnat1, Guanine nucleotide‐binding protein G(t) subunit alpha‐1; Grk1, G Protein‐Coupled Receptor Kinase 1 [73]. This evidence concerns the gene GRK1 and night blindness.