Uric acid is a chemical present in plasma and other body fluids such as synovial fluid and urine. Uric acid is the final product of purine catabolism (breakdown). Purines play a role in RNA and DNA, among other metabolic and neurotransmission roles. In birds, humans and other primates the enzyme uricase is lacking and uric acid is not further converted to allantoin. The Uric acid is also present in its conjugated form urate.