Dopamine is a neurotransmitter hormone for pleasure and reward. It is synthesized only in the brain cells of human and animals and responsible for the regulation of behavior, mood, memory, cognitive, flexible movement, the body weight and other important functions. The Dopamine Receptor D3 (DRD3) is the most important receptor for dopamine. In this investigation, expression of DRD3 gene was studied in rabbits fed on supplemented diet of dry and fresh faba bean (Vicia faba L. Sakha 3).Our findings indicated the decisive effect of dry faba bean on increasing phenylalanine hydroxylase (PAH)...