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  1. Urea - Wikipedia

  2. Urea | Definition, Formula, Production, Uses, & Facts

  3. Urea Meaning: Definition, Production, and More - Verywell Health

  4. Blood urea nitrogen (BUN) test - Mayo Clinic

  5. Urea - American Chemical Society

  6. Urea Test: High & Low Levels + Normal Range - SelfHacked

  7. Urea | NH2CONH2 | CID 1176 - PubChem

  8. Uremia: Causes, Symptoms, Diagnosis & Treatment - Cleveland Clinic

  9. Urea vs Uric Acid – Clearing Up The Confusion

  10. Urea - Encyclopedia.com