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While it is not clear how these heteromers affect D1 signaling (Fiorentini et al., 2008

It is naturally present in human blood, saliva, urine, and its plasma concentration declines with age from approximately 200 ng/mL at age 20 to under 80 ng/mL after age 60

Free radicals are unstable molecules that can damage DNA, proteins, and cell membranes if left unchecked

Cell types and their interactions in explants of the myenteric and submucous plexuses from guinea pig, rabbit and rat